0002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 1 CN8240 & CN8260 Series Communications & Options omega.com ® TM ® www.omega.com e-mail: info@omega.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 2 CN8240 & CN8260 Series Communications & Options omega.com TM ® ® OMEGAnet ® On-Line Service www.omega.com Internet e-mail info@omega.com Servicing North America: Canada: 976 Bergar Laval (Quebec) H7L 5A1 Tel: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca USA: ISO 9001 Certified One Omega Drive, Box 4047 Stamford CT 06907-0047 Tel: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 3 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 4 CN8240 & CN8260 Series Communications & Options Relay, N.O. Alarm Output Option -AL1, -AL2: Relay, N.O. Alarm Output OUTPUT 2 + N.O. 2 – C 3 + Load 5 amp fuse Supply voltage* 23 24 12 13 N.O. 4 14 N.O. 5 15 16 ALARM 1 Load 5 amp fuse C 6 N.O.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 5 CN8240 & CN8260 Series Communications & Options RS-485 Communications Option -C4: RS-485 (one-to-many) Communications RCV B(-) B(-) XMT A(+) A(+) 23 24 JMP 1 1 1 1 2 SIG GND RS 232 SIG SIG GND GND RS 485 12 3 13 4 14 Option Description: Provides one-to-many communications.
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10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 7 CN8240 & CN8260 Series Communications & Options omega.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 8 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 terminal and the instrument. Note: Multiple instruments cannot be connected to the same port.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 9 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.
002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 10 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.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 11 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 003.00 100 100.00 0100.0 000100 3.2 003.20 0003.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 12 CN8240 & CN8260 Series Communications & Options Digital Communications Option READ COMMAND TO CONTROLLER Read Command Controller ID Checksum $0101R01B7 End of Message Start of Message Parameter Number Zone Number READ RESPONSE FROM CONTROLLER Read Command Data Controller ID Checksum %0101R0502.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 13 CN8240 & CN8260 Series Communications & Options Digital Communications Option WRITE RESPONSE FROM CONTROLLER Write Command Checksum No Error Controller ID %0101W090H8 Parameter Number Start of Message End of Message Zone Number AUXILIARY COMMAND TO CONTROLLER Auxiliary Command Checksum Data Controller ID $0101A020.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 14 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 Queries the value of the Process Variable of Controller #1.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 15 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.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 16 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 This field must contain the uppercase letter ‘A’ DATA A ten-character ASCII representation of a numeric value or 10 alphanumeric ASCII characters.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 17 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 The value of the Process Variable is 21.123 Degrees C. %Ø2Ø1R1Ø1G7 A serial transmission has occurred: Framing Error %Ø1Ø1rØ9Ø21.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 18 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 Default load all parameters has started. %Ø2Ø1AØ2ØØ.ØØØØØØØØB6 RTD low calibration on controller #2 has started.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 19 CN8240 & CN8260 Series Communications & Options Digital Communications Option Table 1.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 20 CN8240 & CN8260 Series Communications & Options Digital Communications Option Table 1.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 21 CN8240 & CN8260 Series Communications & Options Digital Communications Option Table 1.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 22 CN8240 & CN8260 Series Communications & Options Digital Communications Option Table 1.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 23 CN8240 & CN8260 Series Communications & Options Digital Communications Option Table 1.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 24 CN8240 & CN8260 Series Communications & Options Digital Communications Option Table 1.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 25 CN8240 & CN8260 Series Communications & Options Digital Communications Option Auxiliary Commands: Command: Load Parameter Defaults Parameter #: 01 Description Restore all menu parameters to their default values. Request Data Field: Ignored. Response Data Field: Ignored. Command: Perform Process Low Calibration Parameter #: 02 Description: Performs a Low Calibration. The data field in the request message specifies the process.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 26 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: Ignored. Command: Perform Process High Calibration Parameter #: 03 Description: Performs a High Calibration.
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10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 30 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 coverage on each product.
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