Command/Response; B.2.3 Command/Response - Comtech EF Data SDM-2020 Installation And Operation Manual

SDM-2020 Satellite Demodulator
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 demodulator 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:
Rev. 3
>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.
Remote Control Operation
B–3