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B.2.3 command/responses, B.2.4 end character – Comtech EF Data SDM-9000 User Manual

Page 221

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SDM-9000 Satellite Modem

Remote Control Operation

Rev. 4

B–3

B.2.3 Command/Responses

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.

B.2.4 End Character

Each message is ended with a single character which signals the end of the message:

“cr”

Carriage return character for commands

“]”

End bracket for responses