Command/Response; End Character - Comtech EF Data SDM-650B Installation And Operation Manual

Remote Control Operation
B.1.2.3 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:
•
•
•
•
•
Note: "add" is used to indicate a valid 1 to 3 character device address in the range
between 1 and 255.
B.1.2.4 End Character
Each message is ended with a single character which signals the end of the message:
•
•
B–4
>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; use 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.)
"cr" Carriage return character for commands
"]" End bracket for responses
SDM-650B Satellite Modem
Rev. 6