Comtech EF Data SNM-1001L - Manual (Page 277)

SNM-1001L Satellite Modem Revision 1
Remote Control Operation MN/SNM1001L.IOM
B–3
B.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:
>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.
Example: Command: <3/REM_
Response: >3/REM_