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 |
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| 10 alphanumeric ASCII characters. |
| Request Message | Description | |||||||||||||||
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| $Ø1Ø1AØ1XXXXXXXXXXL2<CR> | Tell controller #1 to load all | |||||||||||||||
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| parameters with their defaults. |
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| The 10 X’s are padding characters. |
| $Ø2Ø1AØ2ØØØ1.ØØØØØ69<CR> | Tell controller #2 to perform a low | |||||||||||||||
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| RTD calibration. |
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| END CHAR |
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| CHKSUM |
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| DATA |
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| PARAM |
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| TYPE |
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| ZONE |
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| ID |
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| START CHAR |
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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
13
