A.2.3 Command/Response; A.2.4 End Character - Comtech EF Data SDM-100A Installation And Operation Manual

SDM-100A Satellite Modem

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:
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A.2.4 End Character

Each message is ended with a single character which signals the end of the message:
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Rev. 0
>add/?ER1_parity error'cr''lf']
(Error message for received parity errors.)
>add/?ER2_invalid parameter'cr''lf']
(Error message for a recognized command which cannot be implemented or has parameters
which are out of range.)
>add/?ER3_unrecognizable command'cr''lf']
(Error message for unrecognizable command or bad command syntax.)
>add/?ER4_modem in local mode'cr''lf']
(Modem in local error; send the REM command to go to remote mode.)
>add/?ER5_hard coded parameter'cr''lf']
(Error message indicating that the parameter is hardware dependent and may not be changed
remotely.)
Note: "add" is used to indicate a valid 1 to 3 character device address in the
range between 1 and 255.
"cr"
Carriage return character for commands
"]"
End bracket for responses
Remote Control Operation
A–3