Omega Computer Drive USB 4750 User Manual

Users Guide  
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USB-4750  
32 Channel Isolated Digital I/O  
USB Data Acquisition Module  
 
USB-4750  
32-Channel Isolated  
Digital I/O USB Data Acquisition  
Module  
User Manual  
 
Contents  
Chapter 1 Introduction..................................................... 2  
1.1 Hardware Features............................................................. 2  
1.2 Software Overview............................................................ 3  
1.2.1 More on the CD ............................................................. 3  
Chapter 2 Installation ....................................................... 6  
2.1 Unpacking ......................................................................... 6  
2.2 Driver Installation ............................................................. 7  
2.3 Hardware Installation........................................................ 9  
2.4 Hardware Uninstallation ................................................... 9  
Figure 2.1:Unplug or Eject Hardware Dialog .............. 10  
Figure 2.2:Stop a Hardware device dialog box ............ 10  
Chapter 3 Signal Connections........................................ 12  
3.1 Overview......................................................................... 12  
3.2 I/O Connectors ................................................................ 12  
3.2.1 Pin Assignments .......................................................... 12  
Figure 3.1:I/O Connector Pin Assignment .................. 12  
3.2.2 I/O Connector Signal Description ................................ 13  
Table 3.1:I/O Connector Signal Descriptions .............. 13  
3.2.3 LED Indicator Status Description ................................ 13  
Table 3.2:LED Indicator Status Description ................ 13  
3.3 Isolated Digital I/O Connections..................................... 14  
3.3.1 Dry/Wet Contact Support for Digital Input ................. 14  
Figure 3.2:Isolated Digital Input Connections ............. 14  
3.3.2 Isolated Digital Output Connections ............................ 15  
Figure 3.3:Isolated Digital Output Connections .......... 15  
3.4 Field Wiring Considerations ........................................... 16  
Appendix A Specifications ................................................. 18  
A.1 Isolated Digital Input....................................................... 18  
A.2 Isolated Digital Output.................................................... 18  
A.3 Isolated Counter .............................................................. 18  
A.4 General ............................................................................ 18  
v
Table of Contents  
 
USB-4750 User Manual  
vi  
 
1
2
Introduction  
Sections include:  
Hardware Features  
Software Overview  
 
Chapter 1 Introduction  
Thank you for buying the USB-4750 data acquisition mod- ule. The  
USB-4750 is a powerful data acquisition (DAS) module for the USB port.  
It features a unique circuit design and complete functions for data  
acquisition and control.  
1.1 Hardware Features  
USB-4750 features excellent measurement & control functions:  
32 isolated digital input/output channels  
High-voltage isolation up to 2,500 VDC on all channels  
Dry/wet contact support  
Interrupt handling capability  
High-sink current for isolated output channels (100mA max./Channel)  
Digital output value retained after hot system reset  
Programmable Power-Up States for output channels  
Wiring ternimals on module  
Note:  
You can install up to sixteen USB-4750’s to a  
system because of the restriction of device  
BoardID  
Note:  
The power output of an USB port is 500 mA,  
while the USB-4750 requires 350 mA (Max.).  
This means that if an USB hub is used, it will  
need an external power supply to support more  
than one USB-4750 device.  
Note:  
For detailed specifications of USB-4750, please  
refer to Appendix A, Specifications.  
USB-4750 User Manual  
2
 
1.2 Software Overview  
Omega offers a rich set of DLL drivers, third-party driver support and  
application software on the companion CD-ROM to help fully exploit the  
functions of your device. The Device Drivers feature a complete I/O  
function library to help boost your application performance and work  
seamlessly with development tools such as Visual C++, Visual Basic,  
1.2.1 More on the CD  
For instructions on how to begin programming in each development tool,  
some tutorial chapters are included in the Device Drivers Manual for your  
reference. Please refer to the corresponding sections in these chapters on  
the Device Drivers Manual to begin your programming efforts. You can  
also look at the example source code provided for each programming tool,  
since they can get you very well oriented.  
The Device Drivers Manual can be found on the companion CD-ROM.  
Alternatively, if you have already installed the Device Drivers on your  
system, The Device Drivers Manual can be readily accessed through the  
Start button:  
Start/Programs/Omega USB-4700 Series/ Device Driver’s Manual  
The example source code can be found under the corresponding installa-  
tion folder such as the default installation path:  
Program Files/Omega/USB-4700/Examples  
3
Chapter1  
 
USB-4750 User Manual  
4
 
2
2
Installation  
Sections include:  
Unpacking  
Driver Installation  
Hardware Installation  
Hardware Uninstallation  
 
Chapter 2 Installation  
2.1 Unpacking  
After receiving your USB-4750 package, please inspect its contents first.  
The package should contain the following items:  
USB-4750 Module  
Shielded USB 2.0 Cable (1.8 m)  
Companion CD-ROM (DLL driver included)  
The USB-4750 Module harbors certain electronic components vulnerable  
to electrostatic discharge (ESD). ESD could easily damage the integrated  
circuits and certain components if preventive measures are not carefully  
paid attention to. Before removing the module from the antistatic plastic  
bag, you should take following precautions to ward off possible ESD  
damage:  
Touch the metal part of your computer chassis with your hand to dis-  
charge static electricity accumulated on your body. One can also use a  
grounding strap.  
Make contact between the antistatic bag and ground before opening.  
After taking out the module, you should first:  
Inspect the module for any possible signs of external damage (loose or  
damaged components, etc.). If the module is visibly damaged, please  
notify our service department or our local sales representative immedi-  
ately. Avoid using a damaged module with your system.  
Avoid physical contact with materials that could hold static  
electricity such as plastic, vinyl and Styrofoam.  
USB-4750 User Manual  
6
 
2.2 Driver Installation  
We recommend you install the software driver before you install the  
USB-4750 module into your system, since this will guarantee a smooth  
installation process.  
The 32-bit DLL driver Setup program for the USB-4750 module is  
included on the companion CD-ROM that is shipped with your module  
package. Please follow the steps on the following page to install the  
driver software:  
7
Chapter2  
 
For further information on driver-related issues, an online version of the  
Device Drivers Manual is available by accessing the following path:  
Start/Programs/Omega USB-4700 Series/ Device Driver’s Manual  
USB-4750 User Manual  
8
 
2.3 Hardware Installation  
Note:  
Make sure you have installed the software driver  
before you install the module (please refer to Sec-  
tion 2.2 Driver Installation)  
After the DLL driver installation is completed, you can now go on to  
install the USB-4750 module in any USB port that supports the  
USB 1.1/2.0 standard, on your computer. It is suggested that you refer to  
the computer’s user manual if you have any doubts. Please follow the  
steps below to install the module on your system.  
Step 1: Touch the metal part on the surface of your computer to neutral-  
ize the static electricity that might be in your body.  
Step 2: Plug your USB module into the selected USB port. Use of exces-  
sive force must be avoided; otherwise the module might get damaged.  
Note:  
In case you installed the module without installing the  
DLL driver first, Windows 2000/XP will recognize your  
module as an “unknown device” after reboot, and will  
prompt you to provide necessary driver. You should  
ignore the prompting messages (just click the Cancel  
button) and set up the driver according to the steps  
described in Section 2.2 Driver Installation.  
After your module is installed, you can configure it using the Device  
Manager. The Device Driver's Manual can be found at:  
Start/Programs/Omega USB-4700 Series/ Device Driver’s Manual  
2.4 Hardware Uninstallation  
Though the USB modules are hot swappable, we still recommend you to  
follow the hardware un-installation procedure to avoid any unpredictable  
damages to your device or your system.  
Step1: Close the applications of the USB module.  
9
Chapter2  
 
Step2: Right click the “Unplug or Eject Hardware” icon on your task bar.  
Figure 2.1: Unplug or Eject Hardware Dialog  
Step3: Select “USB-4750 Device” and press “Stop” Button.  
Figure 2.2: Stop a Hardware device dialog box  
Step4: Unplug your USB device from the USB port.  
Note: Please make sure that you have closed the application  
before unplugging the USB device, otherwise unexpected  
system error or damage may occur.  
USB-4750 User Manual  
10  
 
3
2
Signal Connections  
Sections include:  
Overview  
Isolated Digital I/O Connections  
Field Wiring Considerations  
 
Chapter 3 Signal Connections  
3.1 Overview  
Maintaining good signal connections is one of the most important factors  
in ensuring that your application system is sending and receiving data  
correctly. A good signal connection can avoid unnecessary and costly  
damage to your PC and other hardware devices.  
3.2 I/O Connectors  
USB-4750 is equipped with plug-in screw-terminal connectors that facili-  
tate connection to the module without terminal boards or cables.  
3.2.1 Pin Assignments  
Figure 3.1: I/O Connector Pin Assignment  
Note:  
IDI0 shares the same pin with INT0  
IDI4 shares the same pin with INT0_G  
IDI7 shares the same pin with CNT0  
IDI8 shares the same pin with INT1  
IDI12 shares the same pin with INT1_G  
IDI15 shares the same pin with CNT1  
USB-4750 User Manual  
12  
 
3.2.2 I/O Connector Signal Description  
Table 3.1: I/O Connector Signal Descriptions  
Signal  
Reference Direction  
Description  
IDI<0~15>  
INT<0,1>  
GND  
INT_G  
-
Input  
Input  
-
Isolated digital input channels  
Interrupt trigger sources.  
Ground for interrupt pins.  
INT<0,1>_  
G
CNT<0,1>  
GND  
Input  
Output  
-
Isolated input counters  
IDO<0~15> GND  
Isolated digital output channels  
COM<0,1>  
-
Common pins for connecting induc-  
tive loads of isolated output channels  
GND  
-
-
Ground  
3.2.3 LED Indicator Status Description  
The USB Module is equipped with a LED indicator to show the current  
status of the device. When you plug the USB device into the USB port,  
the LED indicator will blink five times and then stay lit to indicate that it  
is on. Please refer to the following table for detailed LED indicator status  
information.  
Table 3.2: LED Indicator Status Description  
LED Status  
Description  
On  
Device ready for work  
Device not ready to work  
Device initialization  
Device working  
Off  
Slow Blinking (5 times)  
Fast Blinking  
(Depends on data transfer speed).  
13  
Chapter3  
 
3.3 Isolated Digital I/O Connections  
3.3.1 Dry/Wet Contact Support for Digital Input  
Each digital input channel accepts either dry contact or 0 ~ 5 VDC wet  
contact inputs. Dry contact capability allows the channel to respond to  
changes in external circuitry (e.g., the closing of a switch in the external  
circuitry) when no voltage is present in the external circuit. Figure 3-1  
shows external circuitry with both wet and dry contact components, con-  
nected as an input source to one of the card's digital input channels.  
Figure 3.2: Isolated Digital Input Connections  
USB-4750 User Manual  
14  
 
3.3.2 Isolated Digital Output Connections  
Each of 8 isolated digital output channels comes equipped with a Darling-  
ton transistor. Every 8 output channels share common collectors and inte-  
gral suppression diodes for inductive loads. Channels 0 ~ 7 use COM0,  
and channels 8 ~ 15 use COM1 as a common pin. If an external voltage (5  
~ 40 V) is applied to an isolated output channel (IDO 0 ~ IDO 15) while it  
is being used as an output channel, the current will flow from the external  
voltage source to the card. Please take care that the current through each  
GND pin not exceed 100 mA.  
Figure 3.3 shows how to connect an external output load to the card's iso-  
lated outputs.  
Figure 3.3: Isolated Digital Output Connections  
15  
Chapter3  
 
3.4 Field Wiring Considerations  
When you use USB-4750 to acquire data from outside, noises in the  
environment might significantly affect the accuracy of your measure-  
ments if due cautions are not taken. The following measures will be  
helpful to reduce possible interference running signal wires between  
signal sources and the USB-4750.  
The signal cables must be kept away from strong electromagnetic  
sources such as power lines, large electric motors, circuit breakers or  
welding machines, since they may cause strong electromagnetic inter-  
ference. Keep the analog signal cables away from any video monitor,  
since it can significantly affect a data acquisition system.  
If the cable travels through an area with significant electromagnetic  
interference, you should adopt individually shielded, twisted-pair wires  
as the analog input cable. This type of cable has its signal wires twisted  
together and shielded with a metal mesh. The metal mesh should only  
be connected to one point at the signal source ground.  
Avoid running the signal cables through any conduit that might have  
power lines in it.  
If you have to place your signal cable parallel to a power line that has a  
high voltage or high current running through it, try to keep a safe dis-  
tance between them. Or place the signal cable in a right angle to the  
power line to minimize the undesirable effect.  
USB-4750 User Manual  
16  
 
A
2
Specifications  
 
Appendix A Specifications  
A.1 Isolated Digital Input  
16  
Channels  
DI0, DI8  
2500 VDC  
25 µs  
Interrupt Inputs  
Optical Isolation  
Opto-isolator ResponseTime  
5~50VDC, or dry contact  
Input Voltage  
A.2 Isolated Digital Output  
16  
Channels  
2500 VDC  
Optical Isolation  
Opto-isolatorResponse Time  
Output Voltage  
25µs  
5 ~ 40 VDC  
100mA/ch. Max. 1.1A/total Max.  
Sink Current  
A.3 Isolated Counter  
2 independent  
Channels  
32-bit counters (low 16bit by hardware and high  
16bit by firmware)  
Resolution  
External 8MHz max. 2 independent program-  
Internal 20MHz max.  
Base Clock  
mable clock sources  
Input frequency from 0.1Hz to 1Mhz  
2 to 65535  
Frequency Measurement  
External Input Divide  
A.4 General  
10-pin screw terminal *4  
132 X 80 X 32 mm (5.2” X 3.2” X 1.3”)  
5 V @ 350 mA max.  
I/O Connector Type  
Dimensions  
Power Consumption  
Operation 0~60° C (32~140° F) (refer to IEC 68-2-1, 2)  
Temperature  
Storage  
-20~70° C (-4~158° F)  
5%~95% RH non-condensing (refer to IEC 68-2-1, 2)  
Relative Humidity  
USB-4750 User Manual  
18  
 
WARRANTY/DISCLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and  
workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an  
additional one (1) month grace period to the normal one (1) year product warranty to cover  
handling and shipping time. This ensures that OMEGA’s customers receive maximum  
coverage on each product.  
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer  
Service Department will issue an Authorized Return (AR) number immediately upon phone or  
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be  
repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting  
from any action of the purchaser, including but not limited to mishandling, improper interfacing,  
operation outside of design limits, improper repair, or unauthorized modification. This  
WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence  
of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibra-  
tion; improper specification; misapplication; misuse or other operating conditions outside of  
OMEGA’s control. Components in which wear is not warranted, include but are not limited to  
contact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. However,  
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability  
for any damages that result from the use of its products in accordance with information  
provided by OMEGA, either verbal or written. OMEGA warrants only that the parts  
manufactured by the company will be as specified and free of defects. OMEGA MAKES  
NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,  
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES  
INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR  
PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of pur-  
chaser set forth herein are exclusive, and the total liability of OMEGA with respect to this  
order, whether based on contract, warranty, negligence, indemnification, strict liability or  
otherwise, shall not exceed the purchase price of the component upon which liability is  
based. In no event shall OMEGA be liable for consequential, incidental or special damages.  
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as  
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;  
or (2) in medical applications or used on humans. Should any Product(s) be used in or with any  
nuclear installation or activity, medical application, used on humans, or misused in any way,  
OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language,  
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability  
or damage whatsoever arising out of the use of the Product(s) in such a manner.  
RETURN REQUESTS/INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.  
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN  
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT  
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be  
marked on the outside of the return package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to  
prevent breakage in transit.  
FOR WARRANTY RETURNS, please have  
the following information available BEFORE  
contacting OMEGA:  
1. Purchase Order number under which  
the product was PURCHASED,  
2. Model and serial number of the product  
under warranty, and  
FOR NON-WARRANTY REPAIRS, consult  
OMEGA for current repair charges. Have the  
following information available BEFORE  
contacting OMEGA:  
1. Purchase Order number to cover the COST  
of the repair,  
2. Model and serial number of the product, and  
3. Repair instructions and/or specific  
problems relative to the product.  
3. Repair instructions and/or specific problems  
relative to the product.  
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.  
This affords our customers the latest in technology and engineering.  
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.  
© Copyright 2007 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,  
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without  
the prior written consent of OMEGA ENGINEERING, INC.  
 
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Process Measurement and Control?  
OMEGA…Of Course!  
Shop online at omega.com  
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