CN8240 & CN8260 Series Communications & Options
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omega.com
®
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CN8240 &
CN8260
SERIES
Communications &
Options Guide
User’s 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
3
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. OMEGA’sWARRANTY 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 OMEGA’S 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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