Comtech EF Data HPCST-5000 - Manual (Page 183)

High Power C-Band Satellite Terminal Remote Control Operation
Rev. 0 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 the RFT-500 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