Multi Tech Systems Network Card MT3334ZDX User Manual

Models MT3334ZDX  
and MT3334ZDXV  
Data/Fax Modem  
Data/Fax/Voice Modem  
Owner's Manual (User Guide)  
 
Contents  
Chapter 1 - Introduction and Description  
Introduction.................................................................................................................... 5  
Requirements ................................................................................................................ 5  
Computer............................................................................................................... 5  
Serial Cable........................................................................................................... 5  
Telephone Line...................................................................................................... 5  
Communications Software ................................................................................... 6  
Product Features........................................................................................................... 6  
Data ....................................................................................................................... 6  
Fax ......................................................................................................................... 7  
Voice (Model MT3334ZDXV only) ........................................................................ 7  
About this Manual ......................................................................................................... 7  
Chapter 1 - Introduction and Description ............................................................. 7  
Chapter 2 - Installation and Connection .............................................................. 7  
Chapter 3 - AT Commands, S-Registers and Result Codes ............................... 8  
Chapter 4 - Testing Your Modem ......................................................................... 8  
Chapter 5 - Service, Warranty & Technical Support ............................................ 8  
Appendices............................................................................................................ 8  
Chapter 2 - Installation  
Introduction.................................................................................................................... 9  
Safety Warnings ............................................................................................................ 9  
Installation Process ....................................................................................................... 9  
LED Indicators............................................................................................................. 12  
Is Your MultiModemZDX Ready for Use? .................................................................. 14  
Operating Your MultiModemZDX................................................................................ 15  
Simple Operations .............................................................................................. 15  
Remote Configuration ................................................................................................. 16  
Software Configuration ............................................................................................... 17  
Hardware/Software Confirmation ....................................................................... 18  
Troubleshooting........................................................................................................... 19  
None of the LEDs Light When the Modem Is On .............................................. 19  
The Modem Does Not Respond to Commands ................................................ 20  
The Modem Dials But Cannot Make Connection .............................................. 22  
The Modem Disconnects While Online.............................................................. 24  
The Modem Cannot Connect When Answering ................................................ 24  
Slow File Transfer ............................................................................................... 25  
Losing Data ......................................................................................................... 25  
Garbage Characters on the Monitor .................................................................. 26  
Chapter 3 - AT Commands, S-Registers and  
Result Codes  
Command Summary ................................................................................................... 27  
S-Registers .................................................................................................................. 36  
Result Codes ............................................................................................................... 41  
 
iii  
Chapter 4 - Modem Testing  
Local Analog Loopback Test/V.54 Loop 3 .................................................................. 42  
Digital Loopback Test/V.54 Loop 2 (Local/Manual) ................................................... 43  
Digital Loopback Test/V.54 Loop 2 (Remote/Auto).................................................... 44  
Chapter 5 - Service, Warranty and Tech Support  
Introduction.................................................................................................................. 46  
Limited Warranty ......................................................................................................... 46  
On-line Warranty Registration ............................................................................ 47  
Tech Support ............................................................................................................... 47  
Recording Modem Information ........................................................................... 47  
Service................................................................................................................. 48  
About the Multi-Tech BBS.......................................................................................... 49  
Logging on to the Multi-Tech BBS ..................................................................... 49  
Downloading a File ............................................................................................. 49  
Reading a Message ............................................................................................ 50  
Leaving a Message ............................................................................................. 50  
Bulletins ............................................................................................................... 51  
About CompuServe/Internet ....................................................................................... 51  
About the Multi-Tech Fax-Back Service ..................................................................... 51  
Appendix A - Technical Specifications  
Appendix B - Tone Dial Frequencies  
Appendix C - Regulatory Information  
FCC Regulations for Telephone Line Interconnection............................................... 57  
Canadian Limitations Notice ....................................................................................... 60  
Compliance with BABT Requirements ....................................................................... 61  
European Low Voltage Directive ........................................................................ 61  
Compliance with BS6305 Clause 6.2, BS6320 Clause 7.2, and BABT/SITS/82/  
005S/D................................................................................................................. 62  
Compliance with BS6789: Section 3.1 and Part 2 ............................................ 63  
Compliance with BS6328 Part 1 ........................................................................ 63  
Modem CE Mark EMC and Safety Compliance ........................................................ 64  
Australian and New Zealand Modem Warning Notice............................................... 64  
Australian Modem Warning Notice..................................................................... 64  
New Zealand Telecom Warning Notice .............................................................. 65  
Index  
 
iv  
1 - Introduction and Description  
Chapter 1 - Introduction and Description  
Introduction  
Welcome to the world of data communications. You have acquired one  
of the finest intelligent data/fax modems available today, the  
MultiModemZDX, from Multi-Tech Systems. This Owner’s Manual will  
help you install, configure, test and use your MultiModemZDX.  
Requirements  
In addition to the contents of the MultiModemZDX package, you will need  
the following equipment.  
Computer  
The MultiModemZDX (MT3334ZDX or MT3334ZDXV) can be connected  
to any computer with an RS-232 serial port, such as the IBM PC, XT, AT,  
andPS/2computers, andmostIBMcompatibles. Notethatyourcomputer  
system should have a processing speed of at least 75 MHz in order to take  
full advantage of the telephony features of this product.  
Serial Cable  
You will need a serial cable to connect the MultiModemZDX to your  
computer. Serial cables are available at computer stores and many office  
supply stores. The cable must have a DB-25P connector at the modem  
end. For IBM and compatible computers, the other end may have a DB-  
25P connector or a DB-9S connector, depending on your particular  
computer and whether you are using the COM1 or the COM2 serial port.  
Telephone Line  
You must have a telephone line with a conveniently located connector  
(jack) to accept the cable that comes with the MultiModemZDX. If you do  
not have a telephone jack near your computer, you should install an  
extension before proceeding.  
 
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MT3334ZDX/V Owner's Manual  
Communications Software  
You will need data communications (datacomm), fax communications  
softwareand,fortheMultiModemZDX,anappropriateapplicationsoftware  
package to access the Personal Voice-Mail features of the  
MultiModemZDXV. The MultiModemZDX is also compatible with  
datacomm and fax programs you may already own.  
Product Features  
General features include:  
Compliance with major ITU-T, TIA, and EIA international standards  
to ensure compatibility with other modems.  
Distinguishes data, fax, or voice calls using DTMF and tone detection  
with software packages supporting these features.  
Caller ID to identify your caller’s phone number (available on U.S.  
products).  
Data  
Supports the enhanced ITU-T V.34 standard, with data transmission  
speeds to 33.6K bps, while also maintaining compatibility with lower-  
speed modems.  
Supports asynchronous data rates at 33.6K, 31.2K, 28.8K, 26.4K,  
24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K, 9600, 4800, 2400, 1200, and  
300 bps.  
Automatic fallback to slower speeds in noisy line conditions, and fall-  
forward to faster speeds as conditions improve.  
ITU V.42 LAP-M and MNP Class 3 and 4 error correction.  
ITU V.42bis (4-to-1) and MNP 5 (2-to-1) data compression.  
Automatic disabling of compression when transferring already-  
compressed files.  
Autodial, redial, pulse (rotary) and touch-tone dial.  
Dialtoneandbusysignaldetectionforreliablecall-progressdetection.  
Compatibility with the standard AT command set used by most  
communication programs.  
 
6
1 - Introduction and Description  
Fax  
Supports V.17, Group 3 fax communication standards, allowing it to  
communicate with other fax modems as well as with fax machines.  
Responds to Class 1 fax commands, enabling it to exchange editable  
and encrypted faxes with other Windows 95 computers.  
Sends and receives faxes from your computer at 14,400 bps, 9600  
bps, 7200 bps, 4800 bps, 2400 bps, or 300 bps.  
Voice (Model MT3334ZDXV only)  
Full-duplex speakerphone support with adjustable speaker volume  
control. Can record and play back answering machine messages  
using optional microphone and speaker.  
Remote/local telephone answering machine (TAM) capabilities  
include voice mail control, record/playback, and call screening.  
Supports the TIA/EIA IS-101 AT+V voice command set.  
Note: For more information on +V commands supported by the  
MT3334ZDXV refer to Multi-Tech's Voice +V Commands Developer's Kit  
(P/N 82039200). This document is available upon request.  
About this Manual  
This manual is divided into five chapters and three appendices. The  
information contained in each chapter and appendix is as follows:  
Chapter 1 - Introduction and Description  
Chapter 1 begins with a short product introduction and description;  
followed by a guide (which you are now reading) to the use of this manual.  
Chapter 2 - Installation and Connection  
Chapter 2 documents the procedure for connecting the MultiModemZDX  
to your computer and to the phone line. Details are given, supported by  
illustrations as a guide for installing your MultiModemZDX to the point of  
operation. There is also a Troubleshooting section in the event your  
MultiModemZDX is not operating properly.  
 
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MT3334ZDX/V Owner's Manual  
Chapter3-ATCommands,S-RegistersandResultCodes  
Chapter 3 documents default and option ATcommands, S-Registers and  
Result Codes supported by the MultiModemZDX.  
Chapter 4 - Testing Your Modem  
Chapter 4 covers the modem's built-in test features. These are: Power-  
on Self Test, Local Analog Loopback, Digital Loopback and Remote  
Digital Loopback Tests. We have included a description of each test and  
how to use each test procedure.  
Chapter 5 - Service, Warranty & Technical Support  
Chapter 5 provides instructions for getting modems serviced at the  
factory, statements on your ten-year warranty, information about our user  
Bulletin Board Service (BBS) and receiving technical support via the  
CompuServe and Internet forums.  
Appendices  
Appendix A - Technical Specifications  
Appendix B - Tone Dial Frequencies  
Appendix C - Regulatory Information  
 
8
2 - Installation  
Chapter 2 - Installation  
Introduction  
This chapter will provide you with the basic steps necessary to install and  
configure your MultiModemZDX. Before attempting any procedure, be  
sure to read the safety warnings in the following section.  
Safety Warnings  
1. Never install telephone wiring during a lightning storm.  
2. Never install telephone jacks in wet locations unless the jack is  
specifically designed for wet locations.  
3. Never touch uninsulated telephone wires or terminals unless the  
telephone line has been disconnected at the network interface.  
4. Use caution when installing or modifying telephone lines.  
5. Avoid using a telephone (other than a cordless type) during an  
electrical storm. There may be a remote risk of electrical shock from  
lightning.  
6. Do not use the telephone to report a gas leak in the vicinity of the leak.  
Installation Process  
The installation of the MultiModemZDX consists of making the physical  
connectionsnecessarytorenderthemodemfunctionalwithyourcomputer.  
Thisincludesmakingtheproperserial,phoneline,andpowerconnections.  
PHONE LINE  
POWER  
RS232  
RJ11/PSTN Connection  
RJ11/Phone Connection  
DB25 to Computer  
Power Connector  
(to Transformer)  
Figure 2-1. MultiModemZDX Connections  
 
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MT3334ZDX/V Owner's Manual  
To install your MultiModemZDX:  
1. Attach the MultiModemZDX to dial-up phone lines using the RJ11  
telephone cord. This is accomplished by plugging one end of the  
cable provided with the MultiModemZDX into the telephone jack in  
your home or office; and plugging the other end into the LINE jack on  
the MultiModemZDX.  
The LINE jack is not interchangeable with the PHONE jack on the  
MultiModemZDX. Do not plug the telephone into the LINE jack or the  
line cable into the PHONE jack.  
2. Attach your MultiModemZDX to your PC or terminal with an RS232  
(or V.24) cable (see Figure 2-1). Be sure to tighten the mounting  
screws on the DB connectors.  
3. Connect your telephone set to phone jack via RJ11 cable.  
4. Attach your MultiModemZDX to the AC Power transformer and  
plugging the AC connector into a live AC outlet.  
5. Turn on power by flipping the "ON/OFF" switch on the side of the  
MultiModemZDX to the "ON" position.  
Note: Use only the power supply provided with the MultiModemZDX.  
Use of any other power supply will void the warranty and could damage  
the modem.  
6. Make sure modem and computer/terminal serial port baud rates are  
adjusted. (Note that several programs can check this for you. If you  
have MS-DOS 5.0 or higher, a program called MSD.EXE [Microsoft  
Diagnostics] is in your DOS directory. Typing MSD at the DOS  
prompt brings up a screen that provides a variety of information about  
your computer. Select COM ports and it lists information about your  
com port, e.g., UART Type, Address, and IRQ, to name a few. Once  
you know your serial port's UART type, you can set your  
communications's software appropriately.)  
7. Proceed to Chapter 3 of this manual, or to your data communications  
software manual.  
 
10  
2 - Installation  
#
Figure 2-2. MultiModemZDX Connections  
 
11  
MT3334ZDX/V Owner's Manual  
LED Indicators  
The MultiModemZDX has ten LED indicators (Figure 2-3) to report status  
(such as verifying proper installation) and line activity (such as monitoring  
the status of a connection).  
Figure 2-3. Front Panel  
TD  
Transmit Data. The TD LED flashes when data is being transmitted (on  
for a space, off for a mark). Signals on this circuit are generated by the  
terminal and transferred to the transmitter of the MultiModemZDX. The  
transmitting terminal should hold this line in the marking state when no  
data is being transmitted, including intervals between characters or  
words. The TRANSMIT (TD) LED indicates the status of this circuit.  
RD  
Receive Data. The RD LED flashes when data is being received (on for  
a space, off for a mark). Data signals received from the remote  
MultiModemZDX are presented on this line. When no carrier signal is  
being received (pin 8 negative), this line will be forced into a marking  
condition. The RECEIVE (RD) LED indicates the status of this signal.  
 
12  
2 - Installation  
CD  
Carrier Detect. This LED lights when a valid carrier signal from another  
modem is detected.  
33  
V.34. This LED is lit when the modem is connected in V.34 mode at  
33,600 bps.  
14  
V.32bis. This LED is lit when the modem is connected in V.32bis mode.  
Note at speeds lower than a V.32bis connection, the MultiModemZDX  
speed LEDs remain unlit.  
96  
9600bps. This LED is lit when the modem is connected at 9600 bps.  
OH  
Off Hook. The condition of Off Hook indicates to the central office that the  
MultiModemZDX wants the phone line to do something (i.e., dial or  
answer a call). This LED is also lit when the MultiModemZDX has  
achieved on-line status.  
 
13  
MT3334ZDX/V Owner's Manual  
TR  
Terminal Ready. When TR is lit, the MultiModemZDX can answer an  
incoming call. This signal (TR or DTR) provides a means for the terminal  
or computer to control the MultiModemZDX's connection to the  
communications channel. A high DTR signal is required by the  
MultiModemZDX to be able to communicate. The state of the TR LED  
matches that of the DTR circuit on pin 20 of the RS232/V.24 interface.  
EC  
Error Correction. This LED is lit when the modem is set for V.42 error  
correction, and flashes on and off when data compression is activated.  
FX  
Fax. This LED is lit when the modem is connected in Fax mode.  
Is Your MultiModemZDX Ready for Use?  
As soon as you have connected power to the modem, if you’re an  
experienced modem user, you may simply want to check your modem’s  
settings for data compression, error correction, and so on. You may find  
that you can get moving quite quickly if you just issue the AT&V<cr>  
command. This command lists how your modem is currently configured.  
If you come across a setting you’re unsure of, refer to Chapter 3 of this  
manual for AT command and S-Register explanations and defaults. If  
you’re a novice, please continue to the next sections of this chapter.  
 
14  
2 - Installation  
Operating Your MultiModemZDX  
You control your MultiModemZDX by issuing AT commands and setting  
S-Registers. Right now your MultiModemZDX is set up for the most typical  
user application, that is, as a traditional modem set to make a dial-up call  
toaremoteinstallationwherethecallisansweredautomatically;therefore,  
you shouldn’t need to change the current default configuration. (If  
however, you know that your application does not follow this profile,  
please refer to Chapter 3 for AT Commands and S-Registers.)  
In operating your MultiModemZDX it is likely that you will use your data  
communications software to either:  
enter “terminal” mode, where you can “speak most directly” to the  
modem by issuing AT commands, or to  
launch a datacomm session through a set of modem configurations  
which you select and then associate with a target telephone number.  
Once you have created, saved, and named this set of information  
according to your connection needs and your datacomm software’s  
conventions, the software then simplifies your dialing because you  
needn’t reconfigure your modem, nor run the risk of mistakenly  
keying-in incorrect information.  
Either way, you need to understand that an AT command is the method  
by which your modem is controlled, and must therefore prefix nearly all  
commands. AT stands for attention, and alerts the modem that a  
command follows. You may enter these commands with either upper- or  
lower-case characters. Entering AT automatically sets the modem’s  
serial baud rate to match your computer’s and also sets the modem’s  
parity. It also clears the modem’s command buffer. Once you’re in  
terminal mode, enter AT followed by <CR> to check whether your modem  
is operational. If everything’s fine, your modem will respond OK.  
Simple Operations  
You can dial by using the ATD command and the phone number of the  
modem with which you wish to connect, e.g., ATD6127853500. Your  
modem will dial the number; a “scrambling” noise is heard as the modem  
negotiates the kind of connection it can make, and once the modems have  
settled on a common connection, a connect message on your computer’s  
video is displayed. To hang up a call, enter +++ATH<CR>. Your modem  
will return on hook, just as if you had returned a phone’s handset to its  
cradle. Your video now displays OK, signifying that your modem is ready  
for your next command.  
 
15  
MT3334ZDX/V Owner's Manual  
Remote Configuration  
The Remote Configuration feature is a network management tool that  
allows you to configure modems remotely. This means you could  
configure modems anywhere in your network from one location without  
having to visit the sites or rely on remote users to follow your instructions.  
You can download new parameters and implement new features.  
S-RegisterS9hasbeensetuptocontainthespecialRemoteConfiguration  
escape code. When calling a Remote Configuration equipped modem,  
youentertheproperRemoteEscapeCodeenteringyourSet-upPassword.  
You can then execute AT commands as if you were connected locally. If  
you set S-Register S9 to 0 (zero), Remote Configuration is disabled.  
Setting S9 to a value other than zero, defines the escape key. For  
example, if S9 = 37, the % (percent sign) would be the escape key. The  
S9 value can be stored with the &W0 command.  
To store the remote configuration password, type the following:  
AT#S=password<RETURN>  
The password can be from 1 to 8 characters in length and is case  
sensitive. This password can be changed in command mode but not in  
remote configuration. If no user password has been stored, the default  
password is "MTSMODEM". If a user password has been set, the default  
password is disabled.  
To enter Remote Configuration from online mode, enter the value in S9  
three times, the type ATpassword <RETURN>. For example:  
If S9 = 37, enter: %%%ATpassword<RETURN> and you will be  
in command mode.  
Note: If an AT&F (load factory defaults) command is entered, or if an ATZ  
(modem reset) command is entered and S9 has not been saved, S9 will  
return to zero. However, if either of these two commands are entered, the  
password will remain saved.  
 
16  
2 - Installation  
Software Configuration  
Communications software must be configured to work with the  
MultiModemZDX, your computer, and the remote system it is calling.  
Fortunately, most communications programs make the process easy by  
providing a default initialization string to your modem as well as defaults  
for most of the other required parameters.  
Some software programs allow you to select your modem type from a  
menu. By this method, initialization strings that correspond to a particular  
modem type can be selected to operate optimally with the software it is  
utilizing.  
Figure 2-4. MultiModemZDX Initialization Setup  
Other software programs require you enter an initialization string in the  
software modem setup screen. If this is the requirement in your software  
application, enter the following command string to initialize your modem:  
AT&F<cr>  
This setting configures your modem to operate optimally with the software  
it is utilizing.  
Note: Refer to your respective software manual for further information on  
your communications software.  
 
17  
MT3334ZDX/V Owner's Manual  
Hardware/Software Confirmation  
To confirm that your modem (hardware) and communications package  
(software) is working properly:  
1. Go into terminal mode in your communications package.  
2. To determine if your computer and modem are communicating  
properly, Enter: AT<CR> At this point your video monitor should  
display OK. If the characters you typed do not appear or if double  
characters appear, see the troubleshooting section of this chapter.  
3. ToconfirmhowyourMultiModemZDXisconfigured,enterAT&V<cr>.  
What is then reported is how the MultiModemZDX is currently  
configured.  
Figure 2-5. MultiModemZDX Configuration Confirmation  
 
18  
2 - Installation  
Troubleshooting  
Your MultiModemZDX was thoroughly tested at the factory before it was  
shipped. If you are unable to make a successful connection or if you  
experience data loss or garbled characters during your connection, it is  
possible that the modem is defective. However, it is more likely that the  
source of your problem lies elsewhere. Problems you may encounter  
include:  
None of the LEDs light when the modem is on;  
The modem does not respond to commands;  
The modem dials but is unable to make a connection;  
The modem disconnects while online;  
The modem cannot connect when answering;  
Slow file transfer;  
Losing data; or  
Garbage characters on the monitor.  
None of the LEDs Light When the Modem Is On  
When you turn on the MultiModemZDX, the LED indicators on the front  
panel should flash briefly as the modem runs a self-test. If the LEDs  
remain off, the modem is probably not receiving power.  
Make sure the modem’s power switch is on, especially if you normally  
turn on the modem by turning on a power strip.  
If the power supply is plugged into a power strip, make sure the power  
strip is plugged in, and its power switch is on.  
Make sure the power supply module is firmly connected to the  
modem and to the wall outlet or power strip.  
If the power strip is on and the modem switch is on, try moving the  
modem power supply to another outlet on the power strip.  
Test the outlet is live by plugging a lamp into it.  
The modem or power supply may be defective. If you have another  
Multi-Tech modem, try swapping modems. If the problem goes away,  
the first modem or power supply may be defective. Call Tech Support  
for assistance.  
Note: Do not under any circumstances replace the power supply module  
with one designed for another product, as it may damage the modem and  
void your warranty.  
 
19  
MT3334ZDX/V Owner's Manual  
The Modem Does Not Respond to Commands  
Make sure the modem is plugged in and turned on. (See “None of the  
LEDs Light When the Modem Is On.”)  
Make sure you are issuing the modem commands from the data  
communications software, either manually in terminal mode or  
automatically once you have configured the software. (You cannot  
send commands to the modem from the DOS prompt.)  
Make sure you are in terminal mode in your data communications  
program, then type AT and press ENTER. If you get an OK response,  
yourconnectionsaregoodandtheproblemlikelyisinyourphonebook  
entry or session settings.  
Try resetting your modem by turning it off and on. Make sure there is  
a reset command (&F) in your initialization string, or your modem  
may not initialize correctly.  
If you don’t get an OK, the problem may still be in the communications  
software. Make sure you have done whatever is necessary in your  
softwaretomakeaportconnection.Notallcommunicationsprograms  
connect to the COM port automatically. Some connect when the  
software loads and remain connected until the program terminates.  
Others can disconnect without exiting the program. Many  
communications software packages also allow multiple terminals to  
be open, but only one can access the modem at a time. If your  
package reports that it cannot make a connection, yet the modem’s  
TR indicator is on, click on the Window menu to see if more than one  
terminal is open. The modem’s TR indicator shows that the software  
has made a connection with the modem through the COM port.  
Your communications software settings may not match the physical  
port the modem is connected to. The serial cable may be plugged into  
the wrong connector—check your computer documentation to make  
sure. Or you may have selected a COM port in your software other  
than the one the modem is physically connected to—compare the  
settings in your software to the physical connection.  
If the modem is on, the cable is plugged into the correct port, the  
communications software is configured correctly, and you still don’t  
get an OK, the fault may be in the serial cable. Make sure it is firmly  
connected at both ends.  
Is this the first time you have used the cable? If so, it may not be  
correct. Check the cable description on the packaging to make sure  
the cable is the right one for your computer.  
 
20  
2 - Installation  
Peripheral expansion cards, such as bus mouse and sound cards,  
may include a serial port preconfigured as COM1 or COM2. The extra  
serial port, or the card itself, may use the same COM port, memory  
address, or interrupt request (IRQ) as your communications port. Be  
sure to disable any unused ports.  
To look for address or IRQ conflicts if you use Windows 3.1x, select  
File, Run in Program Manager, type MSD, and press ENTER. Then  
select Mouse, COM Ports, and IRQ Status and note the addresses  
and IRQs that are in use. If you find an IRQ conflict, note which IRQs  
are not being used, then change one of the conflicting devices to use  
one of the unused IRQs. If you find an address conflict, change the  
address of one of the conflicting devices.  
To change a port address or IRQ in Windows 3.1x, double-click the  
Control Panel icon, then the Ports icon. Click on the port you want to  
change, click Settings, click Advanced, and select the new port  
address and/or interrupt. If you wish to use COM3 or COM4, note that  
COM3 shares an IRQ with COM1, as does COM4 with COM2, so you  
should change their IRQs to unused ones, if possible.  
If you use Windows 95, right-click on My Computer, select Properties  
from the menu, click on the Device Manager tab, double-click on  
Ports, then double-click on the Communications Port your modem is  
connected to. In the port’s Properties sheet, click on the Resources  
tab to see the port’s Input/Output range and Interrupt Request. If  
another device is using the same address range or IRQ, it will appear  
in the Conflicting Device List. Uncheck Use Automatic Settings to  
change the port’s settings so they do not conflict with the other  
device, or select the port the conflicting device is on and change it  
instead. If you need to open your computer to change switches or  
jumpersontheconflictingdevice;refertothedevice’sdocumentation.  
The serial port may be defective. If you have another serial port,  
install the modem on it, change the COM port setting in your software,  
and try again.  
The modem may be defective. If you have another Multi-Tech  
modem, try swapping modems. If the problem goes away, the first  
modem is possibly defective. Call Tech Support for assistance (see  
Chapter 5).  
 
21  
MT3334ZDX/V Owner's Manual  
The Modem Dials But Cannot Make Connection  
There can be several reasons the MultiModemZDX fails to make a  
connection. Possibilities include  
lack of a physical connection to the telephone line.  
a wrong dial tone.  
a busy signal.  
a wrong number.  
no modem at the other end.  
a faulty modem, computer, or software at the other end.  
incompatibility between modems.  
You can narrow the list of possibilities by using extended result codes. To  
enable them, enter ATV1X4 and press ENTER while in terminal mode, or  
include V1X4 in the modem’s initialization string. When you dial again, the  
modem will report the call’s progress.  
If the modem reports NO DIALTONE, check that the modem’s  
telephone line cable is connected to both the modem’s LINE jack (not  
the PHONE jack) and the telephone wall jack. If the cable looks  
secure, try replacing it. If that doesn’t work, the problem may be in  
your building’s telephone installation. To test the building installation,  
plug a telephone into your modem’s telephone wall jack and listen for  
a dial tone. If you hear a dial tone, your modem may be installed  
behind a company phone system (PBX) with an internal dial tone that  
sounds different from the normal dial tone. In that case, the modem  
may not recognize the dial tone and may treat it as an error. Check  
your PBX manual to see if you can change the internal dial tone; if you  
can’t, change your modem’s initialization string to replaceX4 withX3,  
which will cause the modem to ignore dial tones.  
If the modem reports BUSY, the other number may be busy, in which  
case you should try again later, or it may indicate that you have failed  
to add a 9, prefix to the phone number if you must dial 9 for an outside  
line.  
If you must dial 9 to get an outside line, the easiest way to dial it  
automatically is to include it in the modem’s dial prefix, e.g., ATDT9,.  
Note the comma, which inserts a pause before the number is dialed.  
By inserting 9, into the dial prefix, you do not have to include it in each  
directory entry.  
 
22  
2 - Installation  
To change the dial prefix in your communications package, select  
Setup, Modem; then select the modem type you are using, and type  
the new prefix in the Dial Prefix box. To change the dial prefix in  
Windows Terminal, select Settings, Modem Commands. To change  
it in Windows 95 HyperTerminal, select Call, Connect from the menu  
bar, click Dialing Properties, and type 9 in the local and long distance  
boxes in How I Dial from This Location.  
If the modem reports NO ANSWER, the other system has failed to go  
off-hook, or you might have dialed a wrong number. Check the  
number.  
If the modem reports NO CARRIER, the phone was answered at the  
other end, but no connection was made. You might have dialed a  
wrong number, and a person answered instead of a computer, or you  
might have dialed the correct number but the other computer or  
software was turned off or faulty. Check the number and try again, or  
try calling another system to make sure your modem is working. Also,  
try calling the number on your telephone. If you hear harsh sounds,  
then another modem is answering the call, and the modems may be  
having problems negotiating because of modem incompatibilities or  
line noise. Try connecting at a lower speed.  
 
23  
MT3334ZDX/V Owner's Manual  
The Modem Disconnects While Online  
If you have call waiting on the same phone line as your modem, it may  
interrupt your connection when someone tries to call you. If you have  
call waiting, disable it before each call. In most telephone areas, you  
can disable call waiting by preceding the telephone number with *70  
(check with your local telephone company).  
You can automatically disable call waiting by including the disabling  
code in the modem’s dial prefix (e.g., ATDT*70,—note the comma,  
which inserts a pause before the number is dialed). To change the  
dial prefix in your communications package, select Setup, Modem;  
then select the modem type you are using, and type the new prefix  
in the Dial Prefix box. To change the dial prefix in Windows Terminal,  
select Settings, Modem Commands. To change it in Windows 95  
HyperTerminal, select Call, Connect from the menu bar, click Dialing  
Properties, check This Location has Call Waiting, and select the  
correct code for your phone service.  
If you have extension phones on the same line as your modem, you  
or someone else can interrupt the connection by picking up another  
phone. If this is a frequent problem, disconnect the extension phones  
before using the modem, or install another phone line especially for  
the modem.  
Check for loose connections between the modem and the computer,  
the telephone jack, and AC power.  
You may have had a poor connection because of line conditions or  
the problem may have originated on the other end of the line. Try  
again.  
If you were online with a BBS, it may have hung up on you because  
oflackofactivityonyourpartorbecauseyouexceededyourtimelimit  
for the day. Try again.  
The Modem Cannot Connect When Answering  
Auto-answermaybedisabled.Turnonauto-answerinyourdatacomm  
program or send the command ATS0=1 to your modem in terminal  
mode.  
 
24  
2 - Installation  
Slow File Transfer  
YoumayhaveanolderUART.Forbestthroughput,installa16550AFN  
UART or a Multi-Tech ISI serial port card.  
If you are running under Windows 3.1 and have a 16550AFN UART,  
you must replace the Windows serial driver, COMM.DRV, to take full  
advantage of the UART’s speed.  
If you are using a slow transfer protocol, such as Xmodem or Kermit,  
try Zmodem or Ymodem/G instead.  
Is your line noisy? If there is static on your line, the modem has to  
resend many blocks of data to insure accuracy. You must have a  
clean line for maximum speed.  
Are you downloading a compressed file with MNP 5 hardware  
compression enabled? Since hardware data compression cannot  
compress a file already compressed by an archiving program, the  
transfer can be marginally slower with data compression enabled.  
Try entering the &V (View Parameters) command, making a screen  
print of the diagnostics listing, and checking for parameters that may  
be unacceptable.  
Losing Data  
If you are using data compression and a high speed serial port, set  
the serial port baud rate to four times the data rate.  
Your UART may not be reliable at serial port speeds over 9600 bps  
or 19,200 bps. Turn off data compression, reset your serial port  
speed to a lower rate, or replace your serial port with a faster one.  
Make sure the flow control method you selected in software matches  
the method selected in the modem.  
If you are running under Windows 3.1 and have a 16550AFN UART,  
you may need to turn on the 16550’s data buffers and/or replace the  
Windows serial driver, COMM.DRV.  
Try entering the &V (View Parameters) command, making a screen  
print of the diagnostics listing, and checking for parameters that may  
be unacceptable.  
 
25  
MT3334ZDX/V Owner's Manual  
Garbage Characters on the Monitor  
Your computer and the remote computer may be set to different word  
lengths, stop bits, or parities. If you have connected at 8-N-1, try  
changingto7-E-1,orvice-versa,usingyourcommunicationssoftware.  
You may be experiencing line noise. Enable error correction, if it is  
disabled, or hang up and call again; you may get a better connection.  
At speeds above 2400 bps, the remote modem might not use the  
same transmission or error correction standards as your modem. Try  
connecting at a slower speed or disabling error correction. (With no  
error correction, however, line noise can cause garbage characters.)  
Try entering the &V (View Parameters) command, making a screen  
print of the diagnostics listing, and checking for parameters that may  
be unacceptable.  
 
26  
3 - AT Commands, S-Registers and Result Codes  
Chapter 3 - AT Commands, S-Registers and  
Result Codes  
Command Summary  
This section summarizes your modem’s AT commands, S-Registers and  
Result codes.  
Command: AT  
Attention Code  
Values:  
n/a  
Description:  
The attention code precedes all command lines  
except A/ and the escape sequence.  
Command: ENTER or Carriage Return <CR> Key  
Values:  
n/a  
Description:  
PresstheENTERorCarriageReturnkeytoexecute  
most commands.  
Command:  
Values:  
A
n/a  
Answer  
Description:  
Answer an incoming call before the final ring.  
Command: A/  
Repeat Last Command  
Values:  
n/a  
Description:  
Repeat the last command string. Do not precede  
this command with AT. Do not press ENTER to  
execute.  
Command: Bn  
Communication Standard Setting  
Values:  
Default:  
n = 0 or 1  
1
Description: B0  
Select ITU-T V.22 mode when modem is at 1200  
bps.  
B1  
Select Bell 212A when modem is at 1200 bps.  
Command: Cn  
Carrier Control  
Values:  
Default:  
n = 1  
1
Description: C1  
Normal transmit carrier switching (included for  
backward compatibility with some software).  
 
27  
MT3334ZDX/V Owner's Manual  
Command: Ds  
Dial  
s = dial string (phone number and dial modifiers)  
none  
Values:  
Default:  
Description:  
Dial telephone number s, where s may be up to 40  
characters long and include the 0–9, *, #, A, B, C,  
and D characters, and the L, P, T, V, W, S, comma  
(,), semicolon (;), !, @, ^ and$ dial string modifiers.  
Dial string modifiers:  
L
Redial last number. (Must be placed immediately  
after ATD.)  
P
T
V
Pulse-dial following numbers in command .  
Tone-dialfollowingnumbersincommand(default).  
Switchtospeakerphonemodeanddialthefollowing  
number. Use ATH command to hang up.  
W
S
Wait for a new dial tone before continuing to dial.  
(X2, X4, X5, X6, or X7 must be selected.)  
Dial a telephone number previously stored using  
the &Zn=x command (see &Zn=x command for  
further information). The range of n is 0-3.  
,
Pause during dialing for time set in register S8.  
;
Return to command mode after dialing. (Place at  
end of dial string.)  
!
Hook flash. Causes the modem to go on-hook for  
one-half second, then off-hook again.  
@
Wait for quiet answer. Causes modem to wait for  
a ringback, then 5 seconds of silence, before  
processing next part of command. If silence is not  
detected, the modem returns a NO ANSWER  
code.  
$
^
Calling Card “Bong” Detection  
Disable data calling tone transmission.  
Command: En  
Echo Command Mode Characters  
Values:  
Default:  
n = 0 or 1  
1
Description: E0  
Do not echo keyboard characters to the computer.  
Do echo keyboard characters to the computer.  
E1  
 
28  
3 - AT Commands, S-Registers and Result Codes  
Echo Online Data Characters  
Command: Fn  
Values:  
Default:  
n = 1  
1
Description: F0  
Enableonlinedatacharacterecho.(Notsupported.)  
F1  
Disable online data character echo (included for  
backward compatibility with some software).  
Command: Hn  
On-Hook/Off-Hook Control  
Values:  
Default:  
n = 0 or 1  
0
Description: H0  
Go on-hook to hang up.  
H1  
Go off-hook to make the phone line busy.  
Command: In  
Information Request  
Values:  
Default:  
n = 0–4  
None  
Description: I0  
Display default speed and controller firmware  
version.  
I1  
I2  
I3  
Calculate and display ROM checksum (e.g.,  
“12AB”).  
Check ROM and verify the checksum, displaying  
OK or ERROR.  
Display default speed and controller firmware  
version.  
I4  
Displayfirmwareversionfordatapump(e.g., “94”).  
Command: Ln  
Monitor Speaker Volume  
Values:  
Default:  
n = 0, 1, 2, or 3  
2
Description: L0  
Select low volume.  
Select low volume.  
Select medium volume.  
Select high volume.  
L1  
L2  
L3  
Command: Mn  
Monitor Speaker Mode  
Values:  
Default:  
n = 0, 1, 2, or 3  
1
Description: M0  
Speaker always off.  
M1  
M2  
M3  
Speaker on until carrier signal detected.  
Speaker always on when modem is off-hook.  
Speaker on until carrier is detected, except while  
dialing.  
 
29  
MT3334ZDX/V Owner's Manual  
Command: Nn  
Modulation Handshake  
Values:  
Default:  
n = 0 or 1  
1
Description: N0  
Modem performs handshake only at  
communication standard specified by S37 and the  
B command.  
N1  
Modem begins handshake at communication  
standard specified by S37 and the B command.  
During handshake, fallback to a lower speed can  
occur.  
Command: On  
Return Online to Data Mode  
Values:  
Default:  
0 or 1  
None  
Description: O0  
Exit online command mode and return to data  
mode (see +++AT<CR>  
command).  
Escape Sequence  
O1  
Issue a retrain and return to online data mode.  
Command: Qn  
Enable/Disable Result Codes  
Values:  
Default:  
n = 0 or 1  
0
Description: Q0  
Enable Result Codes.  
Disable Result Codes.  
Q1  
Command: Sr=n  
Set Register Value  
Values:  
Default:  
r = S-register number; n varies  
None  
Description:  
Set value of register Sr to value of n, where n is  
entered in decimal format.  
Command: Sr?  
Read Register Value  
Values:  
Default:  
r = S-register number  
None  
Description:  
Read value of register Sr and display value in 3-  
digit decimal form.  
Command: Vn  
Terse/Verbose Result Code Format  
Values:  
Default:  
n = 0 or 1  
1
Description: V0  
Displays Result Codes as digits (terse response).  
V1  
Displays Result Codes as words (verbose  
response).  
 
30  
3 - AT Commands, S-Registers and Result Codes  
Result Code Selection  
Command: Xn  
Values:  
Default:  
n = 0–4  
4
Description: X0  
Basic Result Codes (e.g., CONNECT); does not  
look for dial tone or busy signal.  
X1  
X2  
X3  
X4  
ExtendedResultCodes(CONNECT33600V42bis,  
etc.); does not look for dial tone or busy signal.  
Extended Result Codes with NO DIALTONE; does  
not look for busy signal.  
Extended Result Codes with BUSY; does not look  
for dial tone.  
Extended Result Codes with NO DIALTONE and  
BUSY.  
Command: Yn  
Long Space Disconnect  
Values:  
Default:  
n = 0  
0
Description: Y0  
Disable sending or responding to long space break  
signal on disconnect.  
Y1  
Enable sending or responding to long space break  
signal on disconnect. (Not supported.)  
Command: Zn  
Modem Reset  
Values:  
Default:  
n = 0 or 1  
None  
Description: Z0  
Reset modem to profile saved by the last &W  
command.  
Z1  
Same as Z0.  
Command: &Cn  
Data Carrier Detect (DCD) Control  
Values:  
Default:  
n = 0 or 1  
1
Description: &C0  
Ignores the state of carrier on the remote modem  
and DCD circuit is always on.  
&C1  
DCD turns on when the remote modem’s carrier  
signal is detected and DCD is off when the carrier  
signal is not detected.  
 
31  
MT3334ZDX/V Owner's Manual  
Command: &Dn  
Data Terminal Ready (DTR) Control  
Values:  
Default:  
n = 0, 1, 2, or 3  
2
Description: &D0  
Modem ignores the true status of the DTR signal  
and responds as if it is always on.  
&D1  
When DTR drops while in online data mode, the  
modementerscommandmode, issuesanOK, and  
remains connected.  
&D2  
&D3  
When DTR drops while in online data mode, the  
modem hangs up.  
When DTR drops, the modem hangs up and resets  
as if an ATZ command were issued.  
Command: &Fn  
Load Factory Default Settings  
Values:  
Default:  
n = 0  
None  
Description: &F0  
Load factory settings as active configuration.  
Command: &Gn  
V.22bis Guard Tone Control  
Values:  
Default:  
n = 0, 1, or 2  
0
Description: &G0  
Disable guard tone.  
&G1  
&G2  
Enable 550 Hz guard tone.  
Enable 1800 Hz guard tone.  
Command: &Jn  
Auxiliary Relay Control  
Values:  
Default:  
n = 0  
0
Description: &J0  
The auxiliary relay is never closed.  
Not supported—responds ERROR.  
&J1  
Command: &Kn  
Flow Control Selection  
Values:  
n = 0, 3, or 4  
Defaults:  
3
Description: &K0  
Flow control disabled.  
&K3  
&K4  
Enable CTS/RTS hardware flow control.  
Enable XON/XOFF software flow control.  
Command: &Mn  
Communications Mode  
Values:  
Defaults:  
n = 0  
0
Description: &M0  
Asynchronous mode.  
 
32  
3 - AT Commands, S-Registers and Result Codes  
Asynchronous Communications Mode  
Command: &Qn  
Values:  
n = 0, 5, or 6  
Defaults:  
5
Description: &Q0  
Asynchronous with data buffering. Same as \N0.  
Error control with data buffering. Same as \N3.  
Asynchronous with data buffering. Same as \N0.  
&Q5  
&Q6  
Command: &Sn  
Data Set Ready (DSR) Control  
Values:  
Default:  
n = 0 or 1  
0
Description: &S0  
Force DSR high (on).  
Let DSR follow CD.  
&S1  
Command: &Tn  
Test Commands  
Values:  
Default:  
n = 0, 1, 3 or 6  
None  
Description: &T0  
Abort. Stop any test in progress.  
&T1  
&T3  
&T6  
Local analog loop test.  
Local digital loopback test.  
Remote digital loopback test.  
Command: &V  
View Current Configuration  
Values:  
n/a  
Description:  
Displays the active modem settings.  
Command: &Wn  
Store Current Configuration  
Values:  
Default:  
n = 0  
None  
Description: &W0  
Store active modem settings in NVRAM; load them  
atpower-onorfollowingtheATZcommandinstead  
of loading the factory defaults from ROM.  
Command: &Yn  
Select Stored Configuration for Hard Reset  
Values:  
Default:  
n = 0  
0
Description: &Y0  
Select stored configuration 0 on power-up. (For  
backward compatibility with some software.)  
Command: &Zn=x Store Telephone Number  
Values:  
n = 0, 1, 2 or 3  
x = Dialing string  
None  
Default:  
Description:  
Stores telephone dial string x in memory location  
n. Dial the stored number using the command  
ATDS=n.  
 
33  
MT3334ZDX/V Owner's Manual  
Command: \Kn  
Set Break Control  
Values:  
Default:  
n = 5  
5
Description: \K5  
Modem sends break signal received from the DTE  
to the remote modem.  
Command: \Nn  
Error Correction Mode Selection  
Values:  
Default:  
n = 0–5  
3
Description: \N0  
Non-error correction mode with data buffering  
(same as &Q6).  
\N1  
\N2  
\N3  
\N4  
\N5  
Direct mode.  
MNP reliable mode.  
V.42/MNP auto-reliable mode.  
V.42 reliable mode.  
V.42, MNP, or non-error correction (same as \N3).  
Command: \Vn  
Protocol Result Code  
Values:  
Default:  
n = 0 or 1  
1
Description: \V0  
Disable protocol Result Code appended to DCE  
speed.  
\V1  
Enable protocol Result Code appended to DCE  
speed.  
Command: %Cn  
Data Compression Control  
Values:  
Default:  
n = 0 or 1  
1
Description: %C0  
Disable V.42bis/MNP 5 data compression.  
Enable V.42bis/MNP 5 data compression.  
%C1  
Command: $D  
DTR Dialing  
Values:  
Default:  
n = 0 or 1  
0
Description: $D0  
Disables DTR Dialing.  
Enables DTR Dialing.  
$D1  
 
34  
3 - AT Commands, S-Registers and Result Codes  
Modem Baud Rate  
Command: $MB  
Values:  
Default:  
n = speed  
33600  
Description: $MB75  
Selects CCITT V.23 mode.  
Selects 300 bps on-line.  
Selects 1200 bps on-line.  
Selects 2400 bps on-line.  
Selects 4800 bps on-line.  
Selects 9600 bps on-line.  
$MB300  
$MB1200  
$MB2400  
$MB4800  
$MB9600  
$MB14400  
$MB19200  
$MB28800  
$MB33600  
Selects 14400 bps on-line.  
Selects 19200 bps on-line.  
Selects 28800 bps on-line.  
Selects 33600 bps on-line.  
Command: $SB  
Serial Port Baud Rate  
Values:  
Default:  
n = speed  
115200  
Description: $SB300  
Selects 300 bps at serial port.  
Selects 1200 bps at serial port.  
Selects 2400 bps at serial port.  
Selects 4800 bps at serial port.  
Selects 9600 bps at serial port.  
Selects 19200 bps at serial port.  
Selects 38400 bps at serial port.  
Selects 57600 bps at serial port.  
Selects 115200 bps at serial port.  
$SB1200  
$SB2400  
$SB4800  
$SB9600  
$SB19200  
$SB38400  
$SB57600  
$SB115200  
 
35  
MT3334ZDX/V Owner's Manual  
S-Registers  
Certain Command Mode configurations are stored in memory registers  
called, S-Registers. The S command is used to assign a value to, and to  
read the current value of an S-Register. To assign a value to an S-  
Register, enter the letter S, followed by the S-Register number and an  
equals sign (=). To read an S-Register value, enter the letter S followed  
by the S-Register number and a question mark (?), then hit RETURN. To  
verify that the S-Register value was entered correctly, enter for example,  
ATS8? and hit RETURN. You should receive a response of the assigned  
value given to that S-Register.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S0  
rings  
0, 1–255  
0
Sets the number of rings before the modem  
answers. ATS0=0 disables auto-answer  
completely.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S1  
rings  
0, 1–255  
0
Counts the number of rings that have occurred.  
Register:  
Unit:  
Range:  
S2  
decimal  
0-127  
128-255  
43(+)  
Default:  
Description:  
Sets ASCII code for the escape character. Values  
greater than 127 disable the escape sequence.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S3  
decimal  
0-127  
13(^M)  
Sets ASCII code for the carriage return character.  
Sets ASCII code for the line feed character.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S4  
decimal  
0–127  
10(^J)  
 
36  
3 - AT Commands, S-Registers and Result Codes  
Register:  
Unit:  
S5  
decimal  
Range:  
Default:  
Description:  
0-32, 33-127  
8(^H)  
Sets ASCII code for the backspacecharacter.  
Values greater than 32 disable the backspace  
character.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S6  
seconds  
2-65  
2
Sets the time the modem waits after it goes off-  
hook before it begins to dial the telephone number.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S7  
seconds  
1-255  
50  
Sets the time the modem waits for a carrier signal  
before aborting a call. Also sets the wait for silence  
time for the @ dial modifier.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S8  
seconds  
0-65  
2
Sets the length of a pause caused by a comma  
character in a dialing command.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S9  
ASCII  
0-127  
0
Defines Remote Configuration Escape Character.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S10  
100ms  
1-254  
20  
Sets how long a carrier signal must be lost before  
the modem disconnects.  
 
37  
MT3334ZDX/V Owner's Manual  
Register:  
Unit:  
Range:  
Default:  
Description:  
S11  
1 ms  
50-150  
95  
Sets spacing and duration of dialing tones.  
0 disables, 1–255 enables V.34 modulation.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S28  
decimal  
0, 1-255  
1
Register:  
Unit:  
Range:  
Default:  
Description:  
S30  
1 minute  
0-255  
0
S30 specifies the length of time (in minutes) that  
the modem waits before disconnecting when no  
data is sent or received. This function is only  
applicable to buffer mode.  
Register:  
Unit:  
Range:  
S35  
decimal  
0-1  
Default:  
Description:  
0
0 disables, 1 enables the V.25 data calling tone,  
which allows remote data/fax/voice discrimination.  
Register:  
Unit:  
S36  
decimal  
Range:  
Default:  
Description:  
{0,2}, {1,3}, {4,6}, {5,7}  
NA  
This register specifies the action to take in the  
event of negotiation failure when error control is  
selected. (See S48.)  
 
38  
3 - AT Commands, S-Registers and Result Codes  
Register:  
Unit:  
Range:  
Default:  
Description:  
S37  
decimal  
0-19  
0
Sets the maximum dial line rate.  
0 = maximum modem speed  
1 = reserved  
2 = 1200/75 bps  
3 = 300 bps  
4 = reserved  
5 = 1200 bps  
6 = 2400 bps  
7 = 4800 bps  
8 = 7200 bps  
9 = 9600 bps  
10 = 12000 bps  
11 = 14400 bps  
12 = 16800 bps  
13 = 19200 bps  
14 = 21600 bps  
15 = 24000 bps  
16 = 26400 bps  
17 = 28800 bps  
18 = 31200 bps  
19 = 33600 bps  
Register:  
Unit:  
Range:  
S42  
decimal  
0-1  
Default:  
Description:  
1
For testing and debugging only. Enables/disables  
the V.32bis and V.22bis auto rate. Retrain and  
fallback are disabled in data mode. 0 = disable; 1  
= enable.  
Register:  
Unit:  
Range:  
S43  
decimal  
0-1  
Default:  
Description:  
1
For testing and debugging only. Enables/disables  
V.32bis start-up auto mode operation. 0 = disable;  
1 = enable.  
 
39  
MT3334ZDX/V Owner's Manual  
Register:  
Unit:  
Range:  
Default:  
Description:  
S48  
decimal  
7 or 128  
7
The following chart lists the S36 and S48  
configuration settings necessary to negotiate  
certain types of connections.  
Register:  
Unit:  
Range:  
Default:  
Description:  
S89  
seconds  
0, 5-255  
10  
Sets the length of time in the off-line command  
mode before the modem goes into standby mode.  
A value of zero prevents standby mode; a value of  
1–4 sets the value to 5.  
 
40  
3 - AT Commands, S-Registers and Result Codes  
Result Codes  
When the modem receives an AT command from the terminal or PC, it  
tries to execute the command, then sends a status message to the PC or  
terminal which reports the "results" of the command (hence the name  
"result codes"). The MultiModemZDX Command mode provides you with  
several responses, or “Result Codes”, that provide visual responses  
during Command mode operation. These Result Codes are displayed on  
your PC's video monitor.  
Terse Verbose  
Description  
0
OK  
Command executed  
1
2
CONNECT  
RING  
Modem connected to line  
Ring signal detected  
3
4
NO CARRIER  
ERROR  
Carrier signal lost or not detected  
Invalid command  
5*  
6
7
CONNECT 1200  
NO DIALTONE  
BUSY  
Connected at 1200 bps  
No dial tone detected  
Busy signal detected  
8
NO ANSWER  
CONNECT 2400  
CONNECT 4800  
CONNECT 9600  
CONNECT 14400  
CONNECT 19200  
CONNECT 7200  
CONNECT 12000  
CONNECT 16800  
CONNECT 300  
CONNECT 21600  
CONNECT 24000  
CONNECT 26400  
CONNECT 28800  
CONNECT 31200  
CONNECT 33600  
DELAYED  
No answer at remote end  
Connected at 2400 bps  
Connected at 4800 bps  
Connected at 9600 bps  
Connected at 14400 bps  
Connected at 19200 bps  
Connected at 7200 bps  
Connected at 12000 bps  
Connected at 16800 bps  
Connected at 300 bps  
Connected at 21600 bps  
Connected at 24000 bps  
Connected at 26400 bps  
Connected at 28800 bps  
Connected at 31200 bps  
Connected at 33600 bps  
Delay is in effect for the dialed number  
Dialed number is blacklisted  
Blacklist is full  
10*  
11*  
12*  
13*  
14*  
24*  
25*  
26*  
40*  
55*  
56*  
57*  
58*  
59*  
60*  
88  
89  
90  
BLACKLISTED  
BLACKLIST FULL  
* EC is added to these Result Codes when the extended Result Codes configuration option is  
enabled. EC is replaced by one of the following codes, depending on the type of error control  
connection: V42bis (V.42 error control [LAP-M] and V.42bis data compression); V42 (V.42  
error control [LAP-M] only); MNP5 (MNP 4 error control and MNP 5 data compression); MNP4  
(MNP 4 error control only); NoEC (No error control protocol).  
 
41  
MT3334ZDX/V Owner's Manual  
Chapter 4 - Modem Testing  
Local Analog Loopback Test/V.54 Loop 3  
In this test, data from your computer or terminal is sent to your modem's  
transmitter, converted into analog form, looped back to the receiver,  
converted into digital form and then received back at your monitor for  
verification. No connection to the phone line is required. See Figure 4-1.  
Figure 4-1. Local Analog Loopback Test  
The test procedure is as follows:  
1. Connect the modem to your computer. With your communication  
software, set the desired baud rate.  
2. Type AT&T1 and hit ENTER. This places your modem in Analog  
Loopback mode, in the Originate mode. The modem is now out of the  
Command mode and in a pseudo On-Line mode.  
3. Once you receive a connect message (if responses are enabled),  
enter data from your keyboard. For this test, typing multiple upper  
case "U" characters is a good way to send an alternating test pattern  
of ones and zeros.  
4. For a more complete test, you should also test the modem in Answer  
mode. To do this, you must “escape” from Originate mode by entering  
an Escape Sequence (+++AT<CR>) . Then type AT&T1 and hit  
ENTER to place the modem in Analog Loopback mode, in the Answer  
mode. Then repeat step 3.  
5. Your modem passes this test if the data entered from your keyboard  
are the same as the data received on your monitor. If different data  
is appearing on your monitor, your modem is probably causing the  
problem, although it could also be your computer. If your modem  
passes this test, but you are receiving errors while On-line, the  
remote modem or the phone line could be at fault.  
 
42  
4 - Testing Your Modem  
Digital Loopback Test/V.54 Loop 2 (Local/Manual)  
The Digital Loopback Test is an on-line test that loops data sent from one  
modem across the phone line to another modem, then back to the first  
modem. See Figure 4-2.  
There are two ways to put a modem into Digital Loopback mode.  
1. Locally or Manually, described in this section.  
2. Remotely or Automatically, see next section.  
Note: If you wish to abort any test in progress, enter AT&T0<CR>.  
All loopback tests will operate at all speeds except 300 bps.  
Disable error correction (AT\N0&W0<CR>) before engaging in loopback  
tests.  
In this test the local modem is placed in Digital Loopback mode. Data is  
entered and transmitted from the remote modem (which is not in digital  
loopback mode), sent across the phone line to the local modem and  
looped back to the remote modem.  
The test procedure is as follows:  
1. Go into Terminal mode. Type AT and hit ENTER; you should get an  
OK message.  
2. Dial the remote modem by entering the Dial command and the phone  
number, to establish On-line mode.  
3. TypetheEscapeSequence(+++AT<CR>)whichbringsyourmodem  
into Command mode, while still maintaining the pseudo On-line  
mode with the remote modem.  
4. Type AT&T3 from the local PC and hit ENTER. Once you receive an  
OK message from your modem (if responses are enabled), the local  
modem is placed in Digital Loopback mode.  
5. Data is typed from the remote keyboard. For this test, typing multiple  
upper case "U" characters is a good way to send an alternating test  
pattern of ones and zeros. The data received by the local modem will  
enter its analog receiver, be converted to digital data, be reconverted  
into analog, and then looped through its transmitter back to the  
remote modem. Your modem passes this test if the data entered from  
the remote keyboard is the same as the data received on the remote  
monitor.  
 
43  
MT3334ZDX/V Owner's Manual  
Figure 4-2. Digital Loopback Test(local/manual)  
6. When testing is complete, you may end the test by typing an Escape  
Sequence (+++AT<CR>) to bring your modem into Command mode.  
The modem should respond with an OK message. If you wish to stay  
On-line with the remote modem for normal data transmission, type  
ATO0 and hit ENTER. If you wish to terminate the call, type ATH0  
and hit ENTER to hang up.  
Digital Loopback Test/V.54 Loop 2 (Remote/Auto)  
In this test, your modem must be On-line with another modem set up to  
respond to a request for Digital Loopback (note that some modems may  
not support Remote Loopback or may have this feature disabled). The  
test procedure is as follows:  
1. Go into Terminal mode. Type AT and hit ENTER; you should get an  
OK message.  
2. Dial the remote modem by entering the Dial command and the phone  
number, to establish On-line mode. Note: The &T6 command must  
be set on the remote modem to run this test.  
3. TypetheEscapeSequence(+++AT<CR>)whichbringsyourmodem  
into Command mode, while still maintaining the connection with the  
remote modem.  
4. Type AT&T6 and hit ENTER. The local modem responds to this  
command by transmitting an unscrambled marking signal, which  
causes the remote modem to place itself in Digital Loopback mode.  
Then the local modem exits Command mode and enters pseudo On-  
line mode.  
 
44  
4 - Testing Your Modem  
5. Type data from your keyboard. For this test, typing multiple upper  
case "U" characters is a good way to send an alternating test pattern  
of ones and zeros. The data received by the remote modem will enter  
its analog receiver, be converted to digital data, be reconverted into  
analog, and then looped through its transmitter back to the local  
modem. Your modem passes this test if the data entered from the  
local keyboard is the same as the data received on your monitor.  
Figure 4-3. Digital Loopback Test (remote/automatic)  
 
45  
MT3334ZDX/V Owner's Manual  
Chapter 5 - Service, Warranty and Tech Support  
See New Warranty Policy - Multi-Tech Web Site  
This chapter starts out with statements about your modem's 10-year  
warranty (limited to customers in the U.S., Canada, Mexico and the  
United Kingdom). The next section, Tech Support, should be read  
carefully if you have questions or problems with your modem. It includes  
the technical support telephone numbers, space for recording your  
modem information, and an explanation of how to send in your modem  
should you require service.  
Limited Warranty  
Multi-Tech Systems, Inc. (“MTS”) warrants that its products will be free  
from defects in material or workmanship for a period of ten years from the  
date of purchase, or if proof of purchase is not provided, ten years from  
date of shipment. MTS MAKES NO OTHER WARRANTY, EXPRESSED  
ORIMPLIED,ANDALLIMPLIEDWARRANTIESOFMERCHANTABILITY  
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY  
DISCLAIMED. This warranty does not apply to any products which have  
been damaged by lightning storms, water, or power surges or which have  
been neglected, altered, abused, used for a purpose other than the one  
for which they were manufactured, repaired by the customer or any party  
without MTS’s written authorization, or used in any manner inconsistent  
with MTS’s instructions.  
MTS’s entire obligation under this warranty shall be limited (at MTS’s  
option) to repair or replacement of any products which prove to be  
defective within the warranty period, or, at MTS’s option, issuance of a  
refund of the purchase price. Defective products must be returned by  
Customer to MTS’s factory transportation prepaid.  
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES AND  
UNDER NO CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE  
PURCHASE PRICE FOR DEFECTIVE PRODUCTS.  
 
46  
5 - Service, Warranty and Tech Support  
On-line Warranty Registration  
To register your Multi-Tech product on-line, click on the following link:  
Tech Support  
Multi-Tech has an excellent staff of technical support personnel available  
to help you get the most out of your Multi-Tech product. If you have any  
questions about the operation of this unit, call 1-800-972-2439. Please fill  
out the modem information (below), and have it available when you call.  
If your modem requires service, the tech support specialist will guide you  
on how to send in your modem (see Section 5.3.2).  
Recording Modem Information  
Please fill in the following information on your Multi-Tech modem. This will  
help tech support in answering your questions.  
Modem Model No.: _______________________________________  
Modem Serial No.: _______________________________________  
Modem Firmware Version: _________________________________  
DataComm/FAX/Voice  
Software Version: _______________________________________  
COM Port #: ___________________________________________  
The modem model and serial numbers are silkscreened on the bottom of  
your modem. The software versions are printed on the diskette labels.  
Type ATI4 to display the modem firmware version. Please note the status  
of your modem before calling tech support. This screen messages,  
diagnostic test results, problems with a specific application, etc. Use the  
space below to note modem status:  
_______________________________________________________  
________________________________________________________  
________________________________________________________  
_________________________________________________________  
________________________________________________________  
_________________________________________________________  
 
47  
MT3334ZDX/V Owner's Manual  
Service  
If your tech support specialist decides that service is required, modems  
may be sent (freight prepaid) to our factory. Return shipping charges will  
be paid by Multi-Tech Systems (within North America).  
Include the following with your modem:  
a description of the problem.  
return billing and return shipping addresses.  
contact name and phone number.  
check or purchase order number for payment if the modem is out of  
warranty. (The standard repair charge for this modem is $95. This  
price is valid at the time of this publication but could change in the  
future. Check with your technical support specialist.)  
if possible, note the name of the technical support specialist with  
whom you spoke.  
If you need to inquire about the status of the returned product, be  
prepared to provide the serial number of the product sent (see previous  
section).  
Send modems to this address:  
MULTI-TECH SYSTEMS, INC.  
2205 WOODALE DRIVE  
MOUNDS VIEW, MINNESOTA 55112  
ATTN: SERVICE OR REPAIRS  
 
48  
5 - Service, Warranty and Tech Support  
About the Multi-Tech BBS - No Longer Available  
Multi-Tech Systems maintains a Bulletin Board Service (BBS) for its  
customers. The information available via the BBS includes: new product  
information, product upgrade data, problem solving tips, and a message  
service for you to leave questions for which you would like additional  
information. The phone number for the Multi-Tech BBS is (612) 785-3702  
or (800) 392-2432 (U.S.A. and Canada).  
The BBS can be accessed by any asynchronous modem operating at  
speeds of 33,600-1200 bps (V.34 and downward compatible) with a  
setting of word length of 8 bits, 1 stop bit, and no parity.  
Logging on to the Multi-Tech BBS  
To log on to the Multi-Tech BBS, perform the following steps:  
1. Set your communications program to 8-N-1.  
2. Dial to our BBS at (800) 392-2432 (USA and Canada) or (612) 785-  
3702 (international and local).  
3. At the prompt, type your first name, last name, and password; then  
press RETURN. If you are a first time caller, the BBS will ask if your  
name is spelled correctly. If you answer yes, a questionnaire will  
appear. You must complete the questionnaire to use the BBS on your  
first call.  
4. Press RETURN until the Main Menu appears. From the Main Menu  
you have access to three main areas: the Files Menu, and Message  
Menu, and Bulletins. For help on menu commands, type ?.  
Downloading a File  
If you know the file name:  
1. From the Maim Menu, type F to access the Files Menu, then type D.  
2. Enter the name of the file you wish to download from the BBS.  
3. If a password is required, enter the password.  
4. Answer Y or N to the automatic logoff question.  
5. Select a file transfer protocol by typing the indicated letter, such as  
Z for Zmodem (the recommended protocol).  
 
49  
MT3334ZDX/V Owner's Manual  
6. If you select Zmodem, the transfer will begin automatically. If you  
select another protocol, you may have to initiate the transfer yourself.  
(In most data communications programs, the PAGE DOWN key  
initiates the download.)  
If you don’t know the file name:  
1. From the Main Menu, type F to access the Files Menu. For a list of file  
areas, type L twice. (If you do not type the second L, you will list all  
of the files on the BBS.)  
2. Mark the file areas you would like to examine by typing each file  
area’s list number and a RETURN.  
3. Enter L to list all the files in the selected file areas. Enter C to go  
forward in the file list and P to go back.  
4. Mark one or more files for download by entering M, the list numbers  
of the files, and a RETURN  
5. Enter D. You will see a list of the files you have marked. Enter E if you  
would like to edit the list; otherwise enter D again to start the  
download process.  
6. Select a file transfer protocol by typing the indicated letter, such as  
Z for Zmodem (the recommended protocol).  
7. If you select Zmodem, the file will transfer automatically. If you select  
another protocol, you may have to initiate the transfer yourself. (In  
MEWTERM and many other communications programs, the PAGE  
DOWN key initiates the download.)  
8. When the download is complete, enter S to return to the File Menu.  
Reading a Message  
When you log on, the BBS will tell you if you have a personal message  
(mail). At the prompt Would you like to read it now?, type R to read the  
message. This is the only point at which you can read your mail, since you  
cannot read any messages from the Message Menu.  
Leaving a Message  
The Multi-Tech BBS has no public discussion areas. To leave a personal  
message, select the Message Menu by typing M at the Main Menu. Type  
E, then press RETURN to select the Sysop conference. Enter the name  
of the recipient (or “Sysop”), the subject, and the message text. Press  
ESCAPE to finish, then type S to save the message and exit. To abort the  
message at any point, leave any of the fields blank and press RETURN.  
 
50  
5 - Service, Warranty and Tech Support  
Bulletins  
When you log on, the BBS will ask if you would like to view the bulletin  
menu. The bulletins are menu-driven; to read a bulletin, enter its number.  
You can also access the bulletins by typing B at the Main Menu.  
About CompuServe/Internet - No Longer Available  
InadditiontotheBBS,Multi-TechprovidessupportthroughCompuServe's  
Modem Vendor Forum (GOMODEMVEN) under GO MULTITECH. Refer  
to your CompuServe documentation for special operating procedures.  
Multi-Tech is a commercial provider on the Internet, and we retrieve  
e-mail messages from the following mailboxes on a periodic basis:  
Marketing Dept.  
Sales Dept.  
International Marketing &  
Sales  
Publications Dept.  
If you prefer to recieve support via the internet, you can contact Tech  
Multi-Tech's presence includes a Web site at:  
and an ftp site at:  
Multi-Tech Fax-Back Service - No Longer Available  
Multi-Tech'sfax-backsystemprovides24-houraccesstosales,marketing,  
and technical literature. Dial 612-717-5888, follow the voice prompts,  
and request document number 10 for a catalog of available documents.  
For convenience, have your fax number handy: __________________ .  
From the catalog of available documents, you can order newsletters,  
white papers, press releases, etc. from the sales and marketing index  
(pages 1-4), or order basic modem operation and troubleshooting guides  
fromthetechnicalsupportandengineeringindex. Justentertheapplicable  
FB Doc. # from the left column of the catalog.  
 
51  
MT3334ZDX/V Owner's Manual  
Appendix A - Technical Specifications  
Your MultiModemZDX meets the following specifications:  
Tradename  
MultiModemZDX  
Model Numbers  
Data Rates (modem)  
MT3334ZDX, and MT3334ZDXV  
33,600, 31,200, 28,800, 26,400, 24,000,  
21,600, 19,200, 16,800, 14,400, 12,000,  
9600, 7200, 4800, 2400, 1200, 0-300 bps  
Data Rates (fax)  
Data Format  
14,400, 9600, 7200, 4800, 2400 bps  
Serial, binary, asynchronous at 75-300,  
1200, 2400, 4800, 7200, 9600, 14,400,  
16,800or19,200,21,600,24,000,26,400,  
28,800, 31,200, 33,600 bps  
Compatibility  
ITU V.42bis, V.42, Enhanced V.34, ITU  
V.32bis, V.32, V.21, V.22bis, V.22, V.23,  
ITU V.17, Group 3 T.4, T.30 and EIA TR-  
29 Class 2  
Fax Compatibility  
ITU-T V.17, Group 3, V.29, V.27ter and  
EIA TR-29 Class 2  
Voice Compatibility  
IS-101 AT+V command compatible  
(MT3334ZDXV only)  
Error Correction/  
Data Compression  
V.42 (LAP-M or MNP 3 & 4),  
V.42bis, (4:1 throughput), MNP 5 (2:1  
throughput)  
Speed Conversion  
Serial port data rates adjustable to 300,  
1200, 2400, 4800, 9600, 19,200, 38,400,  
57,600 and 115,200 bps  
Flow Control  
Xon/Xoff,HardwareRTS/CTS,ENQ/ACK  
Mode of Operation  
Fax On-line modes, and “AT” command  
modes supporting Full duplex over dial-  
up lines, "+V AT" (for MT3334ZDXV only)  
Answering Machine and Voice Mail  
functions  
 
52  
Appendices  
Intelligent Features  
Automatic or manual dialing, Automatic  
or manual answer, Microprocessor-  
controlled, remote configuration, EIA  
extended Automode, adaptive line  
probing,automaticsymbolrateandcarrier  
frequencyduringstart-up,retrainandrate  
renegotiation, DTMF detection, Autodial,  
Redial, Repeat dial, Dial linking, Tone  
dial, Dial pauses, Call status display,  
Auto-parity and data rate selection,  
Keyboard-controlled modem options,  
Nonvolatile memory and on-screen  
displays for modem option parameters  
and two telephone numbers/command  
lines of up to 60 digits each, Help menus  
Command Buffer  
Data Modulation  
60 characters  
Trellis Coded Modulation (TCM) at  
33,600, 31,200, 28,800, 26,400, 24,000,  
21,600, 19,200, 16,800, 14,400, 12,000  
and 9600 bps, Quadrature Amplitude  
Modulation (QAM) at 9600 (non-trellis),  
4800 and 2400 bps, PSK at 1200 bps,  
FSK at 300 bps  
Fax Modulation  
V.17 TCM at 14400, 12000, 9600, and  
7200 bps V.29 QAM at 9600 and 7200  
bps V.27ter DPSK at 4800 and 2400 bps  
V.21CH2 FSK at 300 bps (Half Duplex)  
Carrier Frequencies  
1800 Hz V.32/V.32bis/Enhanced V.34/  
33.6K/31.2K/28.8K/26.4K/24K/21.6K/  
19.2K/16.8K/14.4K/12K/9.6K/4.8K  
Voice Compression  
and Sampling Rate  
PCM 128, 8000 kHz or  
IMA ADPCM 8000 kHz (selectable via +V  
commands). Note that your computer  
system should have a processing speed  
of at least 75 MHz to take full advantage  
of the telephony features of this product.  
 
53  
MT3334ZDX/V Owner's Manual  
Carrier Frequencies  
2400 & 1200 bps  
(V.22bis/V.22)  
Transmit Originate:  
Transmit Answer:  
Receive Originate:  
Receive Answer:  
1200 Hz  
2400 Hz  
2400 Hz  
1200 Hz  
Carrier Frequencies  
V.21  
980 Hz Mark, 1180 Hz Space for  
Transmit Originate  
1650 Hz Mark, 1850 Hz Space for  
Transmit Answer  
1650 Hz Mark, 1850 Hz Space for  
Receive Originate  
980 Hz Mark, 1180 Hz Space for  
Receive Answer  
V.23  
390 Hz Mark, 450 Hz Space for  
Transmit Originate  
1300 Hz Mark, 2100 Hz Space for  
Transmit Answer  
1300 Hz Mark, 2100 Hz Space for  
Receive Originate  
390 Hz Mark, 450 Hz Space for  
Receive Answer  
Carrier Frequencies Fax  
V.21 CH2  
Transmit Originate: 1650 Hz Mark,  
1850 Hz Space  
(Half Duplex)  
Transmit Answer: 1650 Hz Mark,  
1850 Hz Space  
V.27ter  
Originate/Answer: 1800 Hz  
Originate/Answer: 1800 Hz  
Originate/Answer: 1800 Hz  
-11dBm (dial-up)  
V.29 QAM  
V.17 TCM  
Transmit Level  
Frequency Stability  
Receiver Sensitivity  
AGC Dynamic Range  
±0.01%  
-43 dBm under worst-case conditions  
43 dB  
 
54  
Appendices  
Interface  
EIA RS232C/CCITT V.24  
Connectors  
DB25 (RS232C) connector; Two RJ11  
modular phone jack: for line, and  
telephone set, power jack.  
Diagnostics  
Indicators  
Power-on Self Test, Local Analog Loop,  
Local Digital Loop, Remote Digital Loop.  
LEDs for Send Data, Receive Data,  
Carrier Detect, various speed indicators,  
Off Hook, Terminal Ready, Error  
Correction, Fax.  
Controls  
Speaker  
Power ON/OFF Switch  
Speaker with software- or command-  
controlled volume.  
Operating  
0° to 50° C  
Temperature  
Power Requirement  
115 Volts AC, 60 Hz, .3 amp (2-prong  
outlet-mounted transformer); 240V/50Hz  
optional (international)  
Power Consumption  
Dimensions  
5 Watts  
14.8 x 10.8 x 2.9 cm (L x W x D)  
224 grams  
Weight  
Limited Warranty  
Five years  
 
55  
MT3334ZDX/V Owner's Manual  
Appendix B - Tone Dial Frequencies  
Hz  
Digits  
697  
770  
852  
941  
1
4
7
2
5
8
3
6
9
A
B
C
0
#
D
*
Hz 1209  
1336  
1477  
1633  
The tone-dialing method combines two frequencies for each of the twelve  
digits found on a Touch Tone dial pad. This method is referred to as Dual-  
Tone Multi-Frequency (DTMF) dialing. The four horizontal rows on a  
Touch-Tone keypad use the four low frequencies (697, 770, 852, 941 Hz),  
while the three vertical columns use the three high frequencies (1209,  
1336, 1477 Hz). The generally accepted tone frequency tolerance is  
+0.02%.  
Forexample,thedigit4wouldbedialedbycombiningtwotonefrequencies.  
It would use the frequency 770 Hz from the second row, and the frequency  
1209 Hz from the first column. In another example, the digit 9 would be  
dialed with the tone frequencies of 852 Hz and 1477 Hz.  
The extended DTMF characters (A, B, C, D) are the high-end frequencies  
(1633 Hz) defined on some telephone sets with a fourth vertical column  
ofbuttons.ThisfourthcolumnprovidesforextendedPBXcontrolfunctions;  
the actual functions provided are dependent on the PBX manaufacturer's  
implementation and feature set.  
 
56  
Appendices  
Appendix C - Regulatory Information - See Web Site  
Multi-Tech Web Site Publishes Current Regulations  
1. ThisequipmentcomplieswithPart68oftheFederalCommunications  
Commission (FCC) rules. On the outside surface of this equipment  
isalabelthatcontains, amongotherinformation, theFCCregistration  
number and ringer equivalence number (REN). If requested, this  
information must be provided to the telephone company.  
2. As indicated below, the suitable jack (Universal Service Order Code  
connecting arrangement) for this equipment is shown. If applicable,  
the facility interface codes (FIC) and service order codes (SOC) are  
shown.  
An FCC-compliant telephone cord and modular plug is provided with  
this equipment. This equipment is designed to be connected to the  
telephone network or premises wiring using a compatible modular  
jack which is Part 68 compliant. See installation instructions for  
details.  
3. The ringer equivalence number (REN) is used to determine the  
quantity of devices which may be connected to the telephone line.  
Excessive REN’s on the telephone line may result in the devices not  
ringing in response to an incoming call. In most, but not all areas, the  
sum of the REN’s should not exceed five (5.0). To be certain of the  
number of devices that may be connected to the line, as determined  
by the total REN’s, contact the telephone company to determine the  
maximum REN for the calling area.  
4. Ifthisequipmentcausesharmtothetelephonenetwork,thetelephone  
company will notify you in advance that temporary discontinuance of  
service may be required. But if advance notice isn’t practical, the  
telephone company will notify the customer as soon as possible.  
Also, you will be advised of your right to file a complaint with the FCC  
if you believe it is necessary.  
5. Thetelephonecompanymaymakechangesinitsfacilities,equipment,  
operations, or procedures that could affect the operation of the  
equipment. If this happens, the telephone company will provide  
advance notice in order for you to make necessary modifications in  
order to maintain uninterrupted service.  
 
57  
MT3334ZDX/V Owner's Manual  
6. If trouble is experienced with this equipment (the model of which is  
indicated below) please contact Multi-Tech Systems, Inc. at the  
address shown below for details of how to have repairs made. If the  
equipment is causing harm to the telephone network, the telephone  
company may request you remove the equipment from the network  
until the problem is resolved.  
7. No repairs are to be made by you. Repairs are to be made only by  
Multi-Tech Systems or its licensees. Unauthorized repairs void  
registration and warranty.  
8. This equipment cannot be used on public coin service provided by  
the telephone company. Connection to Party Line Service is subject  
to state tariffs. (Contact the state public utility commission, public  
service commission or corporation commission for information.)  
9. If so required, this equipment is hearing-aid compatible.  
Manufacturer:  
Model Numbers:  
FCC Registration #:  
Ringer Equivalence:  
Modular Jack (USOC)  
Service Center in USA:  
Multi-Tech Systems, Inc.  
MT3334ZDX, MT3334ZDXV  
AU7USA-31068-MME  
0.4B  
RJ11C or RJ11W (single line)  
Multi-Tech Systems Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
Voice (612) 785-3500/  
FAX (612) 785-9874  
 
58  
Appendices  
NOTE: This equipment has been tested and found to comply with the  
limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.  
These limits are designed to provide reasonable protection against  
harmful interference when the equipment is operated in a residential  
installation. This equipment generates, uses and can radiate radio  
frequency energy, and if not installed and used in accordance with the  
instruction manual, may cause harmful interference to radio  
communications. However, there is no guarantee that interference will  
not occur in a particular installation. If this equipment does cause harmful  
interference to radio or television reception, which can be determined by  
turning the equipment off and on, the user is encouraged to try to correct  
the interference by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
Connect the equipment into an outlet on a circuit different from that of  
which the receiver is connected.  
Consult the dealer or an experienced radio/TV technician for help.  
WARNING: Changes or modifications to this unit not expressly approved  
by the party responsible for compliance could void the user’s authority to  
operate this equipment.  
The Telephone Consumer Protection Act of 1991 makes it unlawful for  
any person to use a computer or other electronic device to send any  
message via a telephone fax machine unless such message clearly  
contains in a margin at the top or bottom of each page or the first page of  
the transmission, the date and time it is sent and an identification of the  
business or other entity, or other individual sending the message and the  
telephone number of the sending machine or such business, other entity,  
or individual. See the cover page of your fax software manual for setup  
details.  
This device complies with Part 15 of the FCC rules. Operation is subject  
to the following conditions: (1) This device may not cause harmful  
interference, and (2) this device must accept any interference received,  
including interference that may cause undesired operation.  
 
59  
MT3334ZDX/V Owner's Manual  
Canadian Limitations Notice  
Notice: The ringer equivalence number (REN) assigned to each terminal  
device provides an indication of the maximum number of terminals  
allowed to be connected to a telephone interface. The termination of a  
interface may consist of any combination of devices subject only to the  
requirement that the sum of the ringer equivalence numbers of all the  
devices does not exceed 5. The ringer equivalence number for this  
product is 0.2.  
Notice: The Industry Canada label identifies certificated equipment. This  
certification means that the equipment meets certain telecommunications  
network protective, operational and safety requirements. The Industry  
Canada does not guarantee the equipment will operate to the user’s  
satisfaction.  
Before installing this equipment, users should ensure that it is permissible  
to be connected to the facilities of the local telecommunications company.  
The equipment must also be installed using an acceptable method of  
connection. The customer should be aware that compliance with the  
aboveconditionsmaynotpreventdegradationofserviceinsomesituations.  
RepairstocertifiedequipmentshouldbemadebyanauthorizedCanadian  
maintenance facility designated by the supplier. Any repairs or alterations  
made by the user to this equipment, or equipment malfunctions, may give  
the telecommunications company cause to request the user to disconnect  
the equipment.  
Users should ensure for their own protection that the electrical ground  
connections of the power utility, telephone lines and internal metallic  
water pipe system, if present, are connected together. This precaution  
may be particularly important in rural areas.  
Caution:Usersshouldnotattempttomakesuchconnectionsthemselves,  
but should contact the appropriate electric inspection authority, or  
electrician, as appropriate.  
 
60  
Appendices  
Compliance with BABT Requirements  
Approved for connection to telecommunications system specified in the  
instructions for use subject to the conditions set out in them.  
Warning: Interconnection directly, or by way of other apparatus, of ports  
marked "SAFETY WARNING see instructions for use" with ports marked  
or not so marked may produce hazardous conditions on the network.  
Advice should be obtained from a competent engineer before such a  
connection is made.  
This apparatus has been approved for the use of the following facilities:  
Auto-calling  
Loop disconnect and MF dialing  
Phone number storage and retrieval by a predetermined code  
Operation in the absence of proceed indication  
Automatic storage of last number dialed  
Tone detection-busy  
Auto clear from the originating end  
DTR dialing  
Modem  
PBX timed break register recall  
European Low Voltage Directive  
When correctly installed and maintained, the modem will present no  
hazard to the user. When correctly installed the modem will be connected  
to the PSTN or a PW and to a Data Terminal Equipment (DTE), whose  
modem connections comply with ITU recommendation V28. The DTE  
connections are therefore taken to be safe voltages (less than ± 30 volts).  
The main power source shall be installed near to the equipment and shall  
be easily accessible. The plug that connect to the apparatus to the main  
power supply must be fitted with a 5A fuse that complies with BSI1362.  
Ports which are capable of connecting to other apparatus are defined as  
SELV. To ensure conformity with EN41003, ensure that these ports are  
only connected to ports of the same type on other apparatus.  
 
61  
MT3334ZDX/V Owner's Manual  
Compliance with BS6305 Clause 6.2, BS6320 Clause 7.2,  
and BABT/SITS/82/005S/D  
a. The modem is suitable for connection to the Public Switched  
Telephone Network (PSTN) provided by British Telecommunications  
plc or Kingston Communications (Hull) plc. Circuit supply by British  
Communications, Mercury Communication, or Hull City Council.  
Only direct exchange lines may be used, not shared service.  
b. The modem is suitable for household, office, and similar general  
indoor use. It is not suitable for use as an extension to a payphone.  
c. BT lines supplied must support either loop disconnect or  
multifrequency tone signalling.  
d. REN (Ringer Equivalence Number).  
The REN value of a unit is calculated from 3/n where n is the total  
number of units which can be connected in parallel which will still  
cause the standard bell (as defined in BS6305 Appendix D) to ring.  
REN values of less than 0.3 cannot be assigned.  
REN = 1  
If a telephone or other device is connected in parallel with the modem, the  
combined REN must not exceed 4. A BT supplied telephone may be  
assumed to have REN of 1.0 unless otherwise noted.  
The approval of this modem for connection to the British Telecom public  
switched telephone network is INVALIDATED if the apparatus is subject  
to any modification in any material way not authorized by BABT or if it is  
used with or connected to:  
i. internal software that has not been formally accepted BABT.  
ii. external control software or external control apparatus which cause  
the operation of the modem associated call set-up equipment to  
contravene the requirements of the standard set out in BABT/SITS/  
82/005S/D.  
All other apparatus connected to this modem and thereby connected  
directly or indirectly to the British Telecom public switched telephone  
network must be approved apparatus as defined in Section 22 of the  
British Telecommunications Act 1984.  
The REN number for this apparatus = 1  
 
62  
Appendices  
Compliance with BS6789: Section 3.1 and Part 2  
a. The modem is not capable of allowing Auto Call using '999' or other  
PABX emergency numbers.  
b. Modes other than modes 1, 2, or 3 should not be used on the BT  
PSTN. This modem is a mode 1 device.  
c. Users are advised to check the numbers entered during the Auto Call  
set up phase prior to dialing.  
d. The user should not issue any sequence of commands to the modem  
which would cause the modem to exceed the maximum allowable  
pause of 8 seconds from the time the modem goes off hook until  
dialing begins.  
e. For correct operation of the call progress monitor, the power has to  
be properly connected and switched on.  
Compliance with BS6328 Part 1  
a. The modem is not suitable for use on circuits with British  
Telecommunications signaling at a normal frequency of 2280 Hz.  
b. The modem does not require signaling or otherwise employ the  
frequency range dc to 200 Hz.  
c. The modem may be connected to a point to point two-wire or four-  
wire Private Circuit.  
d. The modem does not require dc from the Private Circuit for correct  
operation. The modem may be damaged if connected, in a private  
circuitmode,toacircuitsupplyingdccurrent(themaximumpermissible  
direct current is zero amps).  
 
63  
MT3334ZDX/V Owner's Manual  
Modem CE Mark EMC and Safety Compliance  
The CE mark is affixed to the enclosed Multi-Tech product to confirm  
compliance with the following European Community Directives:  
Council Directive 89/336/EEC of 3 May 1989 on the approximation of laws  
of Member States relating to electromagnetic compatibility;  
and  
Council Directive 73/23/EEC of 19 February 1973 on the harmonization  
of the laws of Member States relating to electrical equipment designed for  
use within certain voltage limits;  
both amended by  
Council Directive 93/68/EEC of 22 July 1993 on the harmonization of CE  
marking requirements.  
Australian and New Zealand Modem Warning Notice  
Australian Modem Warning Notice  
Modems connected to the Australian telecommunications network must  
haveavalidAUSTELpermit. Thismodemhasbeenspecificallyconfigured  
to ensure compliance with AUSTEL Standards. The following commands  
can affect compliance and must not be set outside the acceptable range.  
Modem Commands:  
Command  
A:  
Default  
-
Permissible Range  
Do not use  
ATB  
B0  
&G2  
&P1  
see table below  
Do not change  
Do not change  
Do not change  
AT&G  
AT&P  
ATSn  
S-Register  
Default  
Permissible Range  
S6  
4
2 - 5  
 
64  
Appendices  
Call Attempts/Retries:  
Applications software shall be configured so that no more than 3 attempts  
are made to establish a connection to a given number (Note: if the modem  
can detect service tones, up to 10 attempts can be made). There must be  
at least 2 seconds between call attempts. If the call sequence is  
unsuccessful, there shall be a delay of at least 30 minutes before  
attempting to call the number again.  
Failure to set the modem, and any communications software used  
with the modem, to the values shown above will result in the modem  
being operated in a non-compliant manner. Consequently, there  
would be no permit in force for this equipment, and the  
Telecommunications Act 1991 prescribes a penalty of $12,000 for  
the connection of non-permitted equipment.  
For Voice Modems:  
“Distortion may be generated because of low bit rate voice, and reduced  
voice quality may result.”  
WARNING: For safety reasons, only connect AUSTEL permitted or  
AUSTEL certified equipment.”  
Refer to the applicable MultiModemII Owner’s Manual for additional  
information.  
Protection Against Contact with TNV Circuit (Internal PC Cards)  
The protective cover is fastened to the modem card by means that will  
only allow a tool to remove the cover. Warning: removal of the protective  
cover will render the AUSTEL permit void.”  
New Zealand Telecom Warning Notice  
“Use of pulse dialing, when this equipment is connected to the same line  
as other equipment, may give rise to “bell tinkle” or noise and may also  
cause a false answer condition. Should such problems occur, the user  
should NOT contact the Telecom Faults Service.”  
“The preferred method of dialing is to use DTMF tones, as this is faster  
than pulse (decadic) dialing and is readily available on almost all New  
Zealand telephone exchanges.”  
WARNING NOTICE:  
No ‘111’ or other calls can be made from this  
device during a mains power failure”.  
 
65  
MT3334ZDX/V Owner's Manual  
Index  
A
About CompuServe ................................................................. 51  
About the Multi-Tech BBS ........................................................ 49  
AGC Dynamic Range .............................................................. 54  
Answer ..................................................................................... 27  
Answering Machine  
Capabilities ............................................................................. 7  
Asynchronous Communications Mode .................................... 33  
AT Commands ........................................................................... 6  
Attention Code ......................................................................... 27  
Auto Answer (S0) .......................................... 36, 37, 38, 39, 40  
Auxiliary Relay Control ............................................................ 32  
B
BBS ......................................................................................... 49  
British Telecommunications ......................................................... 62  
Bulletins ................................................................................... 51  
C
Call Status ............................................................................... 13  
Call Waiting .............................................................................. 24  
Canadian Limitations Notice .................................................... 60  
Carrier Control ......................................................................... 27  
Carrier Detect .......................................................................... 13  
Carrier Frequencies Fax .......................................................... 54  
COM Ports ................................................................................. 5  
COMM.DRV ............................................................................. 25  
Comma Pause ......................................................................... 37  
Command Buffer ...................................................................... 53  
Communication Standard Setting ............................................ 27  
Communications Mode ............................................................ 32  
Compatibility ............................................................................ 52  
Compliance with BABT Requirements ..................................... 61  
Compliance with BS6328 Part 1 .............................................. 63  
 
66  
Index  
Compression, data .................................................................... 6  
CompuServe/Internet .............................................................. 51  
Connection .............................................................................. 22  
Connectors .............................................................................. 55  
Controls ................................................................................... 55  
D
Data ........................................................................................... 6  
Carrier Detect (DCD) Control ............................................... 31  
Compression ........................................................................ 52  
Compression Control ............................................................ 34  
Features ................................................................................. 6  
Format .................................................................................. 52  
Modulation ............................................................................ 53  
Data Rates (bps) .................................................................. 52  
Data Set Ready (DSR) Control ................................................ 33  
Data Terminal Ready (DTR) Control ........................................ 32  
Datacomm software ............................................................ 6, 20  
DB-25 Connector ....................................................................... 5  
DB-9 Connector ......................................................................... 5  
Diagnostics .............................................................................. 55  
Dial Command ......................................................................... 28  
Dimensions .............................................................................. 55  
Downloading a File .................................................................. 49  
E
Echo Command Mode Characters Command ......................... 28  
Echo Online Data Characters Command ................................ 29  
Enable/Disable Result Codes .................................................. 30  
ENTER or Carriage Return <CR> Key .................................... 27  
Error Correction .................................................................14, 52  
Mode Selection ..................................................................... 34  
European Low Voltage Directive .............................................. 61  
Extended DTMF Characters .................................................... 56  
 
67  
MT3334ZDX/V Owner's Manual  
F
Fall-forward ................................................................................ 6  
Fallback ..................................................................................... 6  
Fax ........................................................................................ 6, 7  
Command set ......................................................................... 7  
Features ................................................................................. 7  
Transmission speeds .............................................................. 7  
Fax Modulation ........................................................................ 53  
Fax-Back Service .................................................................... 51  
FCC Regulations ..................................................................... 57  
Flow Control ............................................................................ 52  
Flow Control ............................................................................ 25  
Frequency Stability .................................................................. 54  
Front Panel .............................................................................. 19  
G
Garbage Characters ................................................................ 26  
Guard Tone Control ................................................................. 32  
H
Hardware/Software Confirmation ............................................. 18  
I
Indicators ................................................................................. 55  
Information Request Command ............................................... 29  
Initialization Strings ............................................................20, 22  
Installation ................................................................................. 9  
Intelligent Features .................................................................. 53  
Interface ................................................................................... 55  
Internet .................................................................................... 51  
K
Kingston Communications (Hull) ............................................. 62  
 
68  
Index  
L
Leaving a Message ................................................................. 50  
LED Indicators ......................................................................... 12  
LEDs ........................................................................................ 19  
Limited Warranty ................................................................46, 55  
Line Feed Character (S4) ........................................................ 36  
Load Factory Default Settings ................................................. 32  
Logging on to the BBS ............................................................. 49  
Long Space Disconnect ........................................................... 31  
Losing Data ............................................................................. 25  
M
MNP 5 ...................................................................................... 25  
Data compression .................................................................. 6  
MNP error correction ................................................................. 6  
Mode of Operation ................................................................... 52  
Model Number ......................................................................... 52  
Modem Cannot Connect When Answering .............................. 24  
Modem CE Mark EMC and Safety Compliance ....................... 64  
Modem Disconnects While Online ........................................... 24  
Modem Does Not Respond to Commands .............................. 20  
Modem Reset .......................................................................... 31  
Modulation Handshake ............................................................ 30  
Monitor Speaker Mode ............................................................ 29  
Monitor Speaker Volume Command ........................................ 29  
MT5634ZDXv Connections .................................................. 9, 11  
MT5634ZDXv Initialization setup ............................................. 17  
Multi-Tech BBS ........................................................................ 49  
MultiExpress for Windows .................................................23, 24  
O
On-hook/off-hook ..................................................................... 29  
On-Hook/Off-Hook Control ...................................................... 29  
Operating Temperature ............................................................ 55  
 
69  
MT3334ZDX/V Owner's Manual  
P
Pause, Dialing ......................................................................... 37  
Power Requirements ............................................................... 55  
Power Supply ....................................................................10, 19  
Protocol Result Code ............................................................... 34  
Protocols .................................................................................. 25  
R
Read Register Value ................................................................ 30  
Reading a Message ................................................................. 50  
Receive Data ........................................................................... 12  
Receiver Sensitivity ................................................................. 54  
Repeat Last Command ............................................................ 27  
Result Code Selection ............................................................. 31  
Result Codes ........................................................................... 22  
Return Character (S3) ............................................................. 36  
Return Online to Data Mode .................................................... 30  
Ringer Equivalence Number .................................................... 62  
RS-232 ...................................................................................... 5  
S
Select Stored Configuration for Hard Reset ............................ 33  
Serial Cable ............................................................................. 20  
Serial Port ..........................................................................21, 25  
Set Break Control .................................................................... 34  
Set Register Value ................................................................... 30  
Software User License Agreement .......................................... 47  
Speaker ................................................................................... 55  
Speakerphone ........................................................................... 7  
Speed Conversion ................................................................... 52  
Speed, transmission  
Data ........................................................................................ 6  
Fax ......................................................................................... 7  
Store Current Configuration ..................................................... 33  
Store Telephone Number ......................................................... 33  
 
70  
Index  
T
Telephone line ..................................................................... 5, 22  
Terminal mode ......................................................................... 20  
Terse/Verbose .......................................................................... 41  
Result Code Format ............................................................. 30  
Test Commands ....................................................................... 33  
Testing ...............................................................................19, 22  
Self-test ................................................................................ 19  
Tradename .............................................................................. 52  
Transmit Data .......................................................................... 12  
Transmit Level ......................................................................... 54  
U
UARTs ..................................................................................... 25  
16550 ................................................................................... 25  
V
V.22 mode ................................................................................ 27  
V.22bis Guard Tone command ................................................. 32  
V.42 error correction .................................................................. 6  
V.42bis data compression .......................................................... 6  
View Current Configuration Command .................................... 33  
Voice .......................................................................................... 7  
Command set ......................................................................... 7  
Features ................................................................................. 7  
Voice Compatibility .................................................................. 52  
Voice Compression .................................................................. 53  
Voice Compression and Sampling Rate .................................. 53  
W
Warranty ............................................................................10, 46  
Weight ..................................................................................... 55  
Windows 3.1 ............................................................................ 25  
serial port driver .................................................................... 25  
X
Xmodem .................................................................................. 25  
 
71  

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