Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 95)

Interface
Chapter 7
Host Commands Using RS-232 or RS-422
7–3
Responses to Commands
After receiving a command, the decoder will send a reply. Response
messages sent from the decoder to the host have the following structure:
(1)
PARAMETER
(2)
END OF
PARAMETER
CODE
(3)
=
(5)
END OF
MESSAGE
CODE
(4)
RESPONSE
CODE
Note: The first two parts of the response may or may not be present
depending upon the command used.
1) The first part of the response is the parameter. Some commands do not
return any parameters.
2) The second part of the response is the end of parameter code. This code is
the same as the end of message code.
3) The third part of the response is = which is equivalent to ASCII 61.
4) The fourth part of the response is the code itself; indicating the status of
the command processing (refer to Table 7.B).
Response
(Hex)
Description
00 Command complete (normal termination)
11 Valid command but format is invalid
50 Command not found
97 Reset to new configuration received
98 Reset to default configuration received
5) The last part of the response code is the end of message control code that
is specified on the communications configuration screen (setup screen #1).
There are four possible end of message codes: CR, CRLF, LF, ETX, or None.
Refer to section titled Setup Screen #1 Data Fields (Chapter 4) for more
information on how to select end of message codes.