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CN8240 & CN8260 Series Communications & Options
13
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
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.
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.
Request Message
Response Message
100 ms max.
10002 Athena Omega:900M124U00.qxd 5/13/08 2:39 PM Page 16