Comtech EF Data SMS-758 - Manual (Page 146)

Remote Control Operation SMS-758 Modem Protection Switch
B–2 MN/SMS758 Rev. 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 one modem protection 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 modem protection switch which is connected to a common remote communications
link must be assigned its own unique address. Addresses are hardware (dipswitch)
selectable at the modem switch, and must be in the range of 1 to 255.
Note: “add” is used to indicate a valid 1 to 3 character device address in the range
between 1 and 255.