Comtech EF Data CST-5000 - Manual (Page 136)

CST-5000 C-Band Satellite Terminal Remote Control Operation
Rev. 9 B–3
B.2.2 Device Address
The device address is the address of the controller which is designated to receive a
transmitted command, or which is responding to a command.
Valid device addresses are 1 to 3 characters long, and in the range of 1 to 255. Address 0 is
reserved as a global address which simultaneously addresses all devices on a given
communications link. Devices do not acknowledge global commands.
Each RFT-500 which is connected to a common remote communications link must be
assigned its own unique address. Addresses are software-selectable and must be in the range
of 1 to 255.
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 an 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 EV, OD, or NO 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_converter in lock mode'cr''lf']
(Controller in lock mode. Must go to enable mode first.)
• >add/?ER5_not supported by hardware'cr''lf']
(Command is a valid command. However, it is not supported by the current hardware
configuration.)
Note: “add” is used to indicate a valid 1 to 3 character device address in the
range between 1 and 255.