Comtech EF Data RSU-503 - Manual (Page 64)

RSU-503 Redundancy Switch Unit Remote Control Operation
Rev. 8 B–3
The general message structure is as follows:
•
Start Character
•
Device Address
•
Command/Response
•
End of Message Character
B.2.1 Start Character
A single character precedes all messages transmitted on the remote link. This character
flags the start of a message. This character is:
•
“<” for commands
•
“>” for responses
B.2.2 Device Address
The device address is the address of the switch 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 switch and RFT connected to a common remote communications link, must be
assigned its own unique address. Addresses are software selectable at the unit, and must be
in the range of 1 to 255.
Note: Global address “*” is reserved for KP-10 (the external keypad) commands. Refer
to the KP-10 External Keypad Installation and Operation Manual.