Comtech EF Data SDR-54A - Manual (Page 81)

SDR-54A Satellite Demodulator Revision 4
Remote Control Specification MN/SDR54A.IOM
A.2.3 Command/Response
The command/response portion of the message contains a variable-length character
sequence which conveys command and response data.
If a satellite modem receives a message addressed to it which does not match the
established protocol or cannot be implemented, a negative acknowledgment message is
sent in response. This message is:
• >1/?ER2_invalid parameter’cr’’lf’]
(Error message for a recognized command which cannot be implemented or has parameters which
are out of range.)
• >1/?ER3_unrecognizable command’cr’’lf’]
(Error message for unrecognizable command or bad command syntax.)
• >1/?ER5_hard coded parameter’cr’’lf’]
(Error message indicating that the parameter is hardware dependent and may not be changed
remotely.)
Note: All commands must be in uppercase.
Example: To enter a data rate of 64 kbit/s, type the following and press
"ENTER":
<1/DR_64
The response should be:
>1/DR_64
A.2.4 End Character
Each message is ended with a single character which signals the end of the message:
• “cr” Carriage return character for commands
• “]” End bracket for responses
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