Omega Engineering Clock Radio CN8240 User Manual

CN8240 & CN8260 Series Communications & Options  
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omega.com  
®
CN8240 &  
CN8260  
SERIES  
Communications &  
Options Guide  
Users Guide  
 
CN8240 & CN8260 Series Communications & Options  
Table of Contents  
For information and instructions related to basic operations, refer to the CN8240/CN8260  
operator’s manual supplied with your controller.  
Option Wiring Diagrams  
Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
24 Volt DC Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Relay, N.O. Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
RS-232 Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
RS-485 Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Transducer Excitation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Auxiliary Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Remote Analog Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Guide to Digital Communications  
Remote Communications Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Omega+ Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Message Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8  
Sample Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9, 10  
Request Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13  
Response Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-15  
Communications Parameter List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-21  
Auxiliary Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22, 23  
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-26  
ii  
 
CN8240 & CN8260 Series Communications & Options  
Relay, N.O.  
Alarm Output  
Option -AL1, -AL2: Relay, N.O. Alarm Output  
N.O.  
2
12  
13  
14  
15  
C
3
4
OUTPUT 2  
+
N.O.  
N.O.  
C
Load  
Load  
5 amp fuse  
5
6
Supply voltage*  
Supply voltage*  
ALARM 1  
ALARM 2  
16  
17  
5 amp fuse  
N.O.  
7
8
C
18  
19  
L1  
9
21 22  
120-250 V  
50-60 Hz  
1
0
2
L2  
0
Option Description: NO (Normally open) relay contact is closed when either alarm is active. The relay life is greater  
than 100,000 operations at 5 operations per second switching full load.  
*Connect load and supply voltage per the following table:  
Load Type  
5 A Voltage Limit  
30 Vdc  
Resistive dc  
Inductive ac (L/R = 7 ms)  
Resistive ac  
20 Vdc  
250 Vac  
Inductive ac (pF = 0.4)  
Motor, ac, 1/6 hp  
Tungsten Lamp, 360 W  
150 Vac  
250 Vac  
120 Vac  
RS-232  
Communications  
Option -C2: RS-232 (one-to-one) Communications  
SIG GND  
RCV XMT  
1
1
1
23  
24  
2
12  
13  
3
Option Description: Provides a one-to-one connection between the controller and an RS-232 port. Computers,  
PLCs, or dumb terminals may be used to set and access controller data.  
1
 
CN8240 & CN8260 Series Communications & Options  
RS-485  
Communications  
Option -C4: RS-485 (one-to-many) Communications  
SIG GND  
JMP 1  
B(-)  
A(+)  
1
1
1
23  
24  
2
12  
13  
14  
3
4
Option Description: Provides one-to-many communications.  
Terminate the controller furthest from the computer by either connecting a 120-ohm, 1/4-watt resistor between ter-  
minals 23 and 24 or using jumper 1 located on the underside of the communications board as shown above.  
Transducer  
Power Supply  
Options -XP1, -XP2, -XP3, -XP4: Transducer Power Supply  
13  
14  
15  
3
4
5
6
16  
17  
7
8
18  
19  
+
MA  
MV  
V
9
21 22  
T/C  
+
RTD  
1
0
2
0
NOTE: FOR  
JUMPER 18  
2
WIRE RTD  
20  
&
0 to1 volt out = 0 to100% RH  
(6 to 30 Vdc input)  
Option Description: The transducer power supply option provides power to remote transducers. The transducer  
outputs, in turn, provide a signal to the controller input which can be scaled in the appropriate engineering units.  
Option -XP1: 15 Vdc  
Option -XP2: 12 Vdc  
Option -XP3: 10 Vdc  
Option -XP4: 5 Vdc  
All options will provide at least 20 mA. The transducer circuitry is thermally protected from short circuits.  
2
 
CN8240 & CN8260 Series Communications & Options  
Process Output  
Options -PVSV1, -PVSV2: Process Output  
23  
24  
Connect jumper between pins 16 and  
17 for option -PVSV2  
2
12  
13  
14  
15  
3
4
Option PVSV2  
(0-5 V)  
5
6
16  
17  
Option -PVSV1  
(4-20 mA)  
7
8
18  
19  
SENSOR  
INPUT  
+
MA  
MV  
V
9
21 22  
T/C  
+
RTD  
1
0
2
0
NOTE: FOR  
JUMPER 18  
2
WIRE RTD  
20  
&
Option Description: The Setpoint Variable or Process Variable is transmitted to a remote device (chart recorders,  
indicators, data recorders, computers, process controllers, etc.) with 1 of 2 different interfaces:  
Option -PVSV1: 4-20 mA  
Option -PVSV2: 0-5 V  
The output signal is scalable in the Auxiliary Output Menu. Multiple remote indicators may be driven by the controller.  
For current (mA) options, the remote indicators are connected in series. The sum of the input resistance for all  
remote indicators must be less than 400 ohms. For voltage options, the remote indicators are connected in parallel.  
The sum of the currents for all remote indicators must be less than 10 mA.  
Remote  
Setpoint Options  
Options -DIC, -RSP4, -RSP5, -RSP6, -RSP7: Remote Setpoint  
Option -DIC  
Options -RSP4, -RSP5, -RSP6, -RSP7  
24  
24  
14  
15  
4
5
6
12  
13  
14  
15  
12  
13  
14  
15  
0-5 V/1-5 V/0-10 V  
0-20 mA/4-20 mA  
}
¡
16  
17  
Enable  
Switch  
Enable  
Switch  
10K  
7
8
16  
17  
16  
17  
18  
19  
CW  
SENSOR  
INPUT  
MA  
MV  
V
9
21 22  
T/C  
RTD  
Remote analog setpoint  
(voltage/current input)  
Remote analog setpoint  
(potentiometer with  
enable switch)  
Switch input only  
Option Description: Remote setpoints use either voltage or current inputs, depending on the specified option:  
Option -DIC: Switch Input Closed  
Option -RSP4: 0-5 Vdc  
Option -RSP5: 1-5 Vdc  
Option -RSP6: 0-20 mA  
Option -RSP7: 4-20 mA  
The input signal is scalable in the Remote Analog Setpoint Menu. Activation of the analog setpoint causes the F1  
indicator to illuminate. For current (mA) options, the input resistance is 255 ohms. For voltage input options, the  
input resistance is greater than 10K ohms. Note: Switch input option -DIC is active when switch is closed. The digital  
input option menu  
controls the programming of this switch.  
*Ground shield at one end, taking care not to run wires next to power circuitry. Maximum length will be determined  
by noise performance.  
3
 
CN8240 & CN8260 Series Communications & Options  
®
omega.com  
®
CN8240/CN8260 Series  
Controllers  
with  
Digital  
Communications  
Option  
4
 
CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Remote Communications Options  
RS-232  
This method allows bidirectional data transfer via a three-conductor cable consisting of signal ground, receive input  
and transmit output. It is recommended for communication distances less than 50 feet between the computer termi-  
nal and the instrument. Note: Multiple instruments cannot be connected to the same port.  
The RS232 port is optically isolated to eliminate ground loop problems. Typically, “Data Out” of the computer/  
terminal connects to the “RCV” terminal. “Data In” connects to the “XMT” terminal. If shielded cable is used, it  
should be connected to the frame ground at one end only. Signal ground is to be connected at appropriate ground  
terminals (refer to wiring diagram on bottom of this page).  
RS-485  
The RS485 multipoint capability allows up to 32 controllers to be connected together in a half-duplex network or up  
to 100 controllers with an appropriate communications repeater.  
This method allows bidirectional data transfer over a twisted pair cable. The twisted pair cable is a transmission line;  
therefore, terminating resistors are required at the most distant ends of the line to minimize reflections (typically 120  
ohms at each end). The RS485 circuit is fully optically isolated, eliminating ground loop problems. Parallel drops  
from the transmission lines should be kept as short as possible; however, the line may be daisy-chained at each  
controller. The polarity of the line is important and each device will specify an “A” (+) and “B” (-) connection.  
Figure 1. Wiring diagram for digital communications.  
DIGITAL COMMUNICATIONS  
SIG GND  
SIG GND  
RCV XMT  
RS 232  
RS 485  
B(-)  
A(+)  
1
1
1
23  
24  
2
12  
13  
14  
15  
3
4
5
6
16  
Three remote communications options are available for the CN8240/CN8260 which allow interfacing to remote  
devices utilizing the most common industry standards: RS232 and RS485.  
Call factory for a recommended RS485 converter.  
5
 
CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Omega+ Protocol  
The Omega+ Protocol provides an easy way to query and modify controller parameters using a personal computer  
and the optional digital communications option of the 18C/25C.  
In this manual, the word “host” refers to the personal computer that’s communicating with the controllers in the  
serial link, and the word “slave” refers to the controllers themselves.  
All transactions between the host and the slaves are done with messages consisting of only printable ASCII charac-  
ters. There are only two primary types of messages: Requests and Responses. Messages coming from the host are  
called requests and messages coming from the slaves are called responses.  
With the exception of a broadcast request, for every request sent from the host, the slave will send back a response.  
If a slave does not respond within 100 milliseconds, then the request can be considered lost.  
A broadcast request is a request having an ID of ‘00’ (see Message Formats below). It is used to address all slaves  
on the network. All slaves on the network will perform the actions requested in a broadcast message. However, a  
response message will not be returned. Therefore, the host can only broadcast Write or Auxiliary Command  
Requests. All slaves will ignore all Read Broadcast Requests.  
Message Formats  
All Omega+ messages adhere to the general format of:  
[START CHAR][ID][ZONE][TYPE][PARAM][ERROR][DATA][CHKSUM][END CHAR]  
START CHAR  
This is a single character which designates the start of the message. For a Request message, this character is the  
ASCII ‘$’ and for a Response message, this character is the ASCII ‘%’.  
ID  
This is a two-character ID identifying the receiving controller. Controller IDs go from 1-255 inclusively and all slaves  
in the network must have unique IDs. The ID number of ‘00’, when used in a request, designates a broadcast mes-  
sage that is used to address all controllers in the network. See the section Request Message for an explanation of the  
broadcast message.  
In order to represent 255 with just two ASCII characters, a number system known as the Message Code Numbering  
System is used. In this system, the most significant digit is represented with the numbers 0-9 and the letters A-Z  
and the least significant digit is represented with the numbers 0-9.  
The numbers 0-9 have the same values as their decimal counterparts and the letters A-Z have the values of 100 - 50  
inclusively in increments of 10.  
Example:  
Message Code Value  
=
Decimal Value  
00  
99  
A0  
A2  
B8  
P5  
0 + 0 = 00  
90 + 9 = 99  
100 + 0 = 100  
100 + 2 = 102  
110 + 8 = 118  
250 + 5 = 255  
Zone  
This is a two character ID identifying the Zone number in multi-zone capable controllers. For the 18C/25C, this num-  
ber must be 01.  
6
 
CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Type  
This is a single character identifying the type of message. The following table lists the type characters for all messages.  
TYPE character  
Message Type  
R
Read Request or Read  
Response Returning a Positive Result  
r
Read Response Returning a Negative Result  
Write Positive Value Request and Response  
Write Negative Value Request and Response  
Auxiliary Command  
W
w
A
For further information, see following sections on the different message types.  
PARAM  
This is a two character, message specific, parameter ID. For a Read/Write Request or Response message, this  
ID identifies the controller parameter. For an Auxiliary Command Request or Response message, this ID specifies  
the command.  
ERROR  
Description  
Code  
0
1
2
3
4
5
6
No error.  
Framing error.  
Hardware error.  
Parity error.  
Bad character in the TYPE field.  
Bad message. Message cannot be understood.  
Bad checksum. The checksum received  
did not match the checksum of the message.  
7
8
Bad zone ID.  
Bad auxiliary command ID. The auxiliary  
command is not supported in this controller.  
9
Bad parameter ID. The parameter is not  
supported in this controller.  
A
Bad data. Bad representation in the data field  
or data is out of range.  
B
C
Attempt to write to a read only parameter.  
Cannot write to a parameter because it’s in use.  
7
 
CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Examples of valid numeric representations for a 6 character data field:  
Numeric Value  
ASCII Representation  
3
3.0000  
000003  
003.00  
100  
3.2  
100.00  
0100.0  
000100  
003.20  
0003.2  
Examples of invalid numeric representations for 6 character data field:  
(B represents a blank, or a space, character)  
Numeric Value  
Bad ASCII Representation  
Why?  
3
BBBBB3  
Leading blanks  
are not allowed.  
3.0BBBB  
-3.20000  
Trailing blanks  
are not allowed.  
3.2  
‘-’ is not allowed.  
CHKSUM  
This is a two character Message Code Numbering System, representing the sum of all the ASCII values of all the  
characters (excluding the START, CHAR, the END CHAR, and the CHKSM themselves) in the message. The sum  
is computed using the following formula:  
CHKSM = SUM(All Message Characters)%256  
% represents the modulus operator.  
END CHAR  
This is a single character designating the end of the message. For all messages, the character used is <CR>, the  
carriage return.  
8
 
CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
READ COMMAND TO CONTROLLER  
Read Command  
Controller ID  
Checksum  
$0101R01B7<CR>  
End of Message  
Start of Message  
Parameter Number  
Zone Number  
READ RESPONSE FROM CONTROLLER  
Read Command  
Checksum  
Data  
Controller ID  
%0101R0502.0000J7<CR>  
Start of Message  
Parameter Number  
Zone Number  
End of Message  
WRITE COMMAND TO CONTROLLER  
Write Command  
Checksum  
Controller ID  
Data  
$0101W1025.000G7<CR>  
End of Message  
Start of Message  
Parameter Number  
Zone Number  
9
 
CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
WRITE RESPONSE FROM CONTROLLER  
Write Command  
No Error  
Checksum  
Controller ID  
%0101W090H8<CR>  
Start of Message  
Parameter Number  
Zone Number  
End of Message  
AUXILIARY COMMAND TO CONTROLLER  
Auxiliary  
Command  
Checksum  
Data  
Controller ID  
$0101A020.0000000067<CR>  
End of Message  
Start of Message  
Parameter Number  
Zone Number  
AUXILIARY RESPONSE FROM CONTROLLER  
Auxiliary  
Command  
Checksum  
No Error  
Controller ID  
%0101A020E9<CR>  
Start of Message  
Parameter Number  
Zone Number  
End of Message  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
The Read Request:  
The Read Request is used to query parameter values and it has the following message format:  
[START CHAR][ID][ZONE][TYPE][PARAM][CHKSUM][END CHAR]  
Field Description: TYPE Must contain the uppercase letter ‘R’.  
Request Message  
Description  
$Ø1Ø1RØ5C1<CR>  
Queries the value of the Process Variable  
of Controller #1.  
$Ø1Ø1RØ9C5<CR>  
$Ø2Ø1RØ9C6<CR>  
Queries the value of the EEPROM  
Setpoint 1 of Controller #1  
Queries the value of the EEPROM  
Setpoint 1 of Controller #2.  
END CHAR  
CHKSUM  
PARAM  
TYPE  
ZONE  
ID  
START CHAR  
Request Messages are sent from the host to the slaves. Each request will have an ID identifying the intended  
recipient of the request. If the ID is ‘00’ (zero), then the request is a broadcast message.  
All slaves will perform the action requested in the broadcast request. However, a response message will not be  
returned. Therefore, it only makes sense to send Write or Auxiliary Command Requests as broadcast requests.  
There are three types of Request Messages: Read, Write, and Auxiliary Commands.  
*Examples of the responses to these requests are given in later sections on Response Messages.  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
The Write Request:  
The Write Request is used to modify parameter values and it has the following message format: [START  
CHAR][ID][ZONE] [TYPE][PARAM][DATA][CHKSUM][END CHAR]  
Field Description: TYPE  
This field must contain one of the following  
two characters.  
W – Value in DATA is a positive value.  
w
– Value in DATA is a negative value.  
DATA  
A six-character ASCII representation of a numeric value.  
Request Message  
$Ø1Ø1WØ91Ø.123G7<CR>  
Description  
Change both the RAM and EEPROM  
copies of Setpoint #1 in controller #1  
to the value of 10.123  
$Ø1Ø1w1Ø1Ø.123J1<CR>  
Change only the RAM copy of setpoint #1  
in controller #1 to the value of -10.123  
(notice the lowercase ‘w’).  
END CHAR  
CHKSUM  
DATA  
PARAM  
TYPE  
ZONE  
ID  
START CHAR  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
The Auxiliary Command Request:  
The Auxiliary Command Request is used to issue commands to the controllers and it has the following message format:  
Field Description:  
TYPE  
DATA  
This field must contain the uppercase letter ‘A’  
A ten-character ASCII representation of a numeric value or  
10 alphanumeric ASCII characters.  
Request Message  
Description  
$Ø1Ø1AØ1XXXXXXXXXXL2<CR>  
Tell controller #1 to load all  
parameters with their defaults.  
The 10 X’s are padding characters.  
$Ø2Ø1AØ2ØØØ1.ØØØØØ69<CR>  
Tell controller #2 to perform a low  
RTD calibration.  
END CHAR  
CHKSUM  
DATA  
PARAM  
TYPE  
ZONE  
ID  
START CHAR  
Response Messages:  
Response Messages are replies to the requests sent from the host. For each  
request received, the slave will reply back with a response.  
For all requests, the Omega+ Protocol specifies a maximum response time  
of 100 milliseconds. If the controller does not start responding within 100  
milliseconds after the last request character is received, that request can be  
considered lost. See Figure 2 below.  
There are three types of Response Messages:  
Read, Write, and Auxiliary Commands.  
Figure 2. Maximum Time Interval Between Host Request and  
Slave (Controller) Response.  
100 ms max.  
Request Message  
Response Message  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
The Read Response:  
The Read Response will be sent in response to a Read Request. Some examples:  
Request Message  
Description  
%Ø1Ø1RØ5Ø21.123K8<CR>  
The value of the Process  
Variable is 21.123 Degrees C.  
%Ø2Ø1R1Ø1G7<CR>  
A serial transmission has occurred:  
Framing Error  
%Ø1Ø1rØ9Ø21.ØØØN8<CR>  
The value of the EEPROM setpoint #1 is  
-21 Degrees C (notice the lowercase ‘r’).  
END CHAR  
CHKSUM  
DATA  
STATUS  
PARAM  
TYPE  
ZONE  
ID  
START CHAR  
The Write Response:  
The Write Response will be sent in response to a Write Request. Some examples:  
Request Message  
Description  
%Ø1Ø1WØ93I1<CR>  
A serial transmission error has occurred:  
Parity error. Write failed.  
%Ø1Ø1w1ØØK2<CR>  
RAM copy of setpoint #1  
modified successfully.  
END CHAR  
CHKSUM  
STATUS  
PARAM  
TYPE  
ZONE  
ID  
START CHAR  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
The Auxiliary Command Response:  
The Auxiliary Command Response will be sent in response to an Auxiliary Command Request. Some examples are:  
Request Message  
Description  
%Ø1Ø1AØ1ØXXXXXXXXXXØ4<CR>  
Default load all parameters  
has started.  
%Ø2Ø1AØ2ØØ.ØØØØØØØØB6<CR>  
RTD low calibration on controller  
#2 has started.  
END CHAR  
CHKSUM  
DATA  
STATUS  
PARAM  
TYPE  
ZONE  
ID  
START CHAR  
Table 1. Communications Parameter List (Omega+ Protocol)  
Number Name  
Read  
Write Data Field Value  
1
2
3
4
Controller Type  
X
X
X
X
0
0
0
0
3
Software Version  
Communications Version  
Status Byte  
This field contains the ASCII  
representation of an 8-bit value  
in which the bit assignments are as follows (starting  
from the least significant bit):  
X
Process Input Error  
RAS Error  
X
0
Always Zero  
Loop Break  
CN8240/CN8260 Parameter Codes  
X
“X”s mark parameters that are supported by  
the CN8240 and CN8260 and “O”s indicate  
parameters that are not supported.  
X
Alarm 1 Active  
Alarm 2 Active  
Always Zero  
Always Zero  
X
0
0
If a bit at a location marked as “X”  
is set, then the condition is TRUE.  
For example, a “48.000” in the data field means that  
both alarm 1 and alarm 2 are active and everything  
else is FALSE.  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Table 1. Continued  
Number Name  
Read Write  
Data Field Value  
5
6
Process Value  
X
X
0
Operating Mode  
X
1 - Manual  
2 - Standby  
3 - Normal (automatic)  
4 - Initiate Autotune  
5 - Recipe Run  
6 - Recipe Hold  
7
8
Access Level  
X
X
X
0
1 - Lockout  
2 - Setpoint  
3 - Setpoint Plus  
4 - User  
5 - Configuration  
6 - Factory  
Contact/Digital Input State  
0 - Switch Open  
1 - Switch Closed  
9
Setpoint, RAM, EEPROM  
Setpoint, RAM Only  
X
X
X
X
10  
11  
Second Setpoint,  
RAM, EEPROM  
X
X
12  
Second Setpoint,  
RAM only  
X
X
X
X
X
X
0
0
0
0
13  
14  
16  
17  
18  
Remote Analog Setpoint  
Recipe Setpoint  
Output 1 Percentage  
Output 2 Percentage  
Manual Control  
Output 1 Percentage  
X
X
19  
Manual Control  
Output 2 Percentage  
X
X
X
X
X
X
X
X
20  
21  
22  
Output 1 Deadband  
Output 1 Hysteresis  
Output 1 Proportional  
Band  
23  
Output 2 Proportional  
Band  
X
X
30  
32  
34  
Rate (Derivative) Value  
Reset (Integral) Value  
X
X
X
X
X
X
Manual Reset  
(Integral) Value  
37  
38  
Output 2 Deadband  
Output 2 Hysteresis  
X
X
X
X
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Table 1. Continued  
Number Name  
Read Write  
Data Field Value  
39  
40  
41  
Autotune Damping  
X
X
1 - Low  
2 - Normal  
3 - High  
Recipe Option  
X
X
X
X
X
X
0 - Disabled  
1 - Single Step  
2 - Multi-Step  
Single-Setpoint  
Ramp Time  
X
X
42-49  
50-57  
Ramp Times 1-8  
Ramp Events 1-8  
X
X
X
X
0 - Disabled  
1 - Event 1 On  
2 - Event 1 Off  
3 - Event 2 On  
4 - Event 2 Off  
58-65  
66-73  
74-81  
Soak Levels 1-8  
Soak Times 1-8  
Soak Events 1-8  
X
X
X
X
X
X
0 - Disabled  
1 - Event 1 On  
2 - Event 1 Off  
3 - Event 2 On  
4 - Event 2 Off  
82  
83  
84  
Recycle Number  
Holdback Band  
Termination State  
X
X
X
X
X
X
0 - Last Setpoint  
1 - Default Setpoint  
2 - Recipe to Standby Mode  
85  
Power Fail Resume  
Enable  
X
X
1 - Resume Off  
2 - Resume On  
86  
87  
88  
89  
90  
91  
Input Bias  
X
X
X
X
X
X
X
X
X
X
X
X
Input Low Scale  
Input High Scale  
Lower Setpoint Limit  
Upper Setpoint Limit  
Input Filter  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Table 1. Continued  
Number Name  
Read Write  
Data Field Value  
92  
Input Type  
X
X
0 - B Thermocouple  
1 - C Thermocouple  
2 - E Thermocouple  
3 - J Thermocouple  
4 - K Thermocouple  
5 - N Thermocouple  
6 - NNM Thermocouple  
7 - R Thermocouple  
8 - S Thermocouple  
9 - T Thermocouple  
10 - Platinel II Thermocouple  
11 - RTD (Integer)  
12 - RTD (Decimal)  
13 - 0-20 mA  
14 - 4-20 mA  
15 - 0-10 mV  
16 - 0-50 mV  
17 - 0-100 mV  
18 - 10-50 mV  
19 - 0-1 V  
20 - 0-5 V  
21 - 0-10 V  
22 - 1-5 V  
94  
95  
Output 1 Type  
X
X
X
X
1 - Inactive/Disabled  
2 - PID  
4 - On/Off  
Output 1 Action  
1 - Direct  
2 - Reverse  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Table 1. Continued  
Number Name  
Read Write  
Data Field Value  
A2  
A3  
Output 1 Cycle Time  
Output 1 Low Limit  
X
X
X
X
A4  
A5  
Output 1 High Limit  
Output 2 Type  
X
X
X
X
1 - Inactive/Disabled  
2 - PID  
4 - On/Off  
A6  
Output 2 Action  
X
X
1 - Direct  
2 - Reverse  
B3  
B4  
Output 2 Cycle Time  
Output 2 Low Limit  
X
X
X
X
B5  
B6  
B7  
Output 2 High Limit  
TC/RTD Decimal Position  
Linear Decimal Position  
X
X
X
X
X
X
B8  
B9  
Display Filter  
Display Units  
X
X
X
X
1 - Fahrenheit  
2 - Celsius  
3 - Kelvin  
C1  
C2  
Display Blanking  
Alarm 1 Action  
X
X
X
X
1- Off  
2 - Normal  
3 - Latched  
4 - Event  
C3  
Alarm 1 Operation  
1- Process High  
2 - Process Low  
3 - Deviation High  
4 - Deviation Low  
5 - Normal Band  
6 - Inverse Band  
C4  
C5  
C6  
C7  
C8  
Alarm 1 Delay  
X
X
X
X
X
X
X
X
X
X
Alarm 1 Inhibit  
Alarm 1 Process Setpoint  
Alarm 1 Deviation Setpoint  
Alarm 2 Action  
1 - Off  
2 - Normal  
3 - Latched  
4 - Event  
C9  
Alarm 2 Operation  
X
X
1 - Process High  
2 - Process Low  
3 - Deviation High  
4 - Deviation Low  
5 - Normal Band  
6 - Inverse Band  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Table 1. Continued  
Number Name  
Read Write  
Data Field Value  
D0  
D1  
D2  
D3  
D4  
D5  
D6  
Alarm 2 Delay  
X
X
X
X
X
X
X
X
X
X
X
0
X
X
Alarm 2 Inhibit  
Alarm 2 Process Setpoint  
Alarm 2 Deviation Setpoint  
Communications Protocol  
Communications ID  
Baud Rate  
1 - Omega +  
0 - 75  
1 - 150  
2 - 300  
3 - 600  
4 - 1200  
5 - 2400  
6 - 4800  
7 - 9600  
0 - 7-0-1  
1 - 7-E-1  
2 - 7-N-2  
3 - 7-0-2  
4 - 7-E-2  
5 - 8-N-1  
6 - 8-0-1  
7 - 8-E-1  
8 - 8-N-2  
D7  
Data Format  
X
X
D8  
Communications  
Transmit Delay  
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
E1  
E2  
E3  
E4  
E5  
E8  
E9  
F0  
F1  
F2  
F3  
Output 1 Failsafe %  
Output 2 Failsafe %  
Loop Break Time  
Highest Reading  
Lowest Reading  
Option Selection  
1 - Comm Option  
TC Zero Calibration  
TC Span Calibration  
RTD Zero Calibration  
RTD Span Calibration  
X
X
X
X
Low-Voltage Zero  
Calibration  
X
X
X
X
X
X
F4  
F5  
Low-Voltage Span  
Calibration  
High-Voltage Zero  
Calibration  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Table 1. Continued  
Number Name  
Read Write  
Data Field Value  
F6  
High-Voltage Span  
Calibration  
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
F7  
Current Zero Calibration  
Current Span Calibration  
Auxiliary Output Variable  
Auxiliary Output Scale Low  
Auxiliary Output Scale High  
RAS Scale Low  
F8  
G1  
G2  
G3  
G5  
G6  
G7  
RAS Scale High  
Contact/Digital Switch  
1 - Disabled  
2 - Second Setpoint Select  
3 - Standby Select  
4 - Run/Hold Switch  
H2  
Autotune State  
X
0
0 - Success  
1 - Aborted  
2 - Error: No PID Output  
3 - Error: No Deviation  
4 - Error: No Output  
5 - Error: Timed out  
6 - Error: Bad Tune  
7 - Waiting for PV to settle  
8 - Reverse Tune In Progress  
9 - Direct Tune In Progress  
H3  
H5  
H6  
H7  
H8  
H9  
Recipe State  
X
X
X
X
X
0
0
X
0
0
Current Recipe Statement  
Active Setpoint  
Resume Exhaustion Flag  
LED Status Indicator  
RTD Decimal Zero  
Calibration  
X
X
X
X
X
X
X
X
X
X
X
X
I0  
I1  
I2  
I3  
I4  
RTD Decimal Span  
Calibration  
1-5 V, 0-10 V  
Zero Calibration  
1-5 V, 0-10 V  
Span Calibration.  
10-050 mV, 0-100 mV  
Zero Calibration  
10-50 mV, 0-100 mV  
Span Calibration  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Auxiliary Commands:  
Command:  
Load Parameter Defaults  
Parameter #:  
Description  
01  
Restore all menu parameters to their default values.  
Request Data Field:  
Response Data Field:  
Command:  
Ignored.  
Ignored.  
Perform Process Low Calibration  
Parameter #:  
Description:  
02  
Performs a Low Calibration. The data field in the request  
message specifies the process. Make sure the prerequisite  
for the calibration is satisfied before issuing a calibration  
command. For instance, the RTD calibration command must  
only be used when the input sensor type is chosen as RTD  
or RTD w/ Decimal.  
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CN8240 & CN8260 Series Communications & Options  
Digital  
Communications Option  
Request Data Fields:  
A 10-character ASCII representation of a numeric value  
specifying what to calibrate.  
0 - Thermocouple  
1 - RTD, Resistive Thermal Device  
2 - Linear  
3 - RAS, Remote Analog Setpoint  
Response Data Field:  
Command:  
Ignored.  
Perform Process High Calibration  
Parameter #:  
03  
Description:  
Performs a High Calibration. The data field in the request  
message specifies the process. Make sure the prerequisite  
for the calibration is satisfied before issuing a calibration  
command. For instance, the RTD calibration command must  
only be used when the input sensor type is chosen as RTD  
or RTD w/ Decimal.  
Request Data Field:  
A 10-character ASCII representation of a numeric value  
specifying what to calibrate.  
0 - Thermocouple  
1 - RTD, Resistive Thermal Device  
2 - Linear  
3 - RAS, Remote Analog Setpoint  
Command:  
Retrieve Display  
Parameter #:  
Description:  
05  
Retrieves the string currently displayed on the slave’s display.  
The data field in the request message specifies which display  
and the data field in the response message contains the string.  
Request Data Field:  
A 10 character ASCII representation of a numeric value  
specifying which display to retrieve data from.  
0 - Lower Display  
1 - Upper Display  
Response Data Field:  
Command:  
The ASCII string.  
Clear Latched Alarms  
10  
Parameter #:  
Description:  
Clear all latched alarms.  
Ignored.  
Request Data Field:  
Response Data Field:  
Ignored.  
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CN8240 & CN8260 Series Communications & Options  
Notes  
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CN8240 & CN8260 Series Communications & Options  
Notes  
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CN8240 & CN8260 Series Communications & Options  
Notes  
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WARRANTY/DISCLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 25  
months from date of purchase. OMEGA's Warranty adds an additional one (1) month grace period to the normal two (2)  
year product warranty to cover handling and shipping time.This ensures that OMEGA’s customers receive maximum cover-  
age 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. OMEGAsWARRANTY 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.ThisWARRANTY isVOID 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 vibration; improper specification; misapplica-  
tion; misuse or other operating conditions outside of OMEGA’s control. Components which wear are not warranted, including but 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 it will be as specified and free of defects. OMEGA MAKES NO OTHER  
WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS 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  
purchaser 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 OMEGAS CUS-  
TOMER 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 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.  
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  
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 2008 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.  
 
Where Do I Find Everything I Need for  
Process Measurement and Control?  
OMEGA…Of Course!  
TEMPERATURE  
Thermocouple, RTD & Thermistor Probes, Connectors,  
Panels & Assemblies  
Wire: Thermocouple, RTD & Thermistor  
Calibrators & Ice Point References  
Recorders, Controllers & Process Monitors  
Infrared Pyrometers  
PRESSURE, STRAIN AND FORCE  
Transducers & Strain Gages  
Load Cells & Pressure Gages  
Displacement Transducers  
Instrumentation & Accessories  
FLOW/LEVEL  
Rotameters, Gas Mass Flowmeters & Flow Computers  
Air Velocity Indicators  
Turbine/Paddlewheel Systems  
Totalizers & Batch Controllers  
pH/CONDUCTIVITY  
pH Electrodes, Testers & Accessories  
Benchtop/Laboratory Meters  
Controllers, Calibrators, Simulators & Pumps  
Industrial pH & Conductivity Equipment  
DATA ACQUISITION  
Data Acquisition & Engineering Software  
Communications-Based Acquisition Systems  
Plug-in Cards for Apple, IBM & Compatibles  
Datalogging Systems  
Recorders, Printers & Plotters  
HEATERS  
Heating Cable  
Cartridge & Strip Heaters  
Immersion & Band Heaters  
Flexible Heaters  
Laboratory Heaters  
ENVIRONMENTAL  
MONITORING AND CONTROL  
Metering & Control Instrumentation  
Refractometers  
Pumps & Tubing  
Air, Soil & Water Monitors  
Industrial Water & Wastewater Treatment  
pH, Conductivity & Dissolved Oxygen Instruments  
900M124U00B  
 

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