Comtech EF Data SMS-458B - Manual (Page 111)

SMS-458B Modem Protection Switch Revision 2
Remote Control Specification MN/SMS458B.IOM
B–3
B.5 Command/Responses
The command/response portion of the message contains a variable length character
sequence, which conveys command and response data.
If a switch 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 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_SWITCH NOT IN REMOTE MODE”cr””lf”]
(Switch not in remote error; use the MODE 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)
>add/?ER6_BUSY”cr””lf”]
(error message indicating that the command sent cannot be carried out because local processing is
utilizing the modem control bus, local keyboard)
B.6 End of Message Character
Each message is ended with a single character, which signals the end of message. This
character is:
•
“cr” (carriage return character) for commands
•
“]” (end bracket) for responses