Comtech EF Data KST-12000 - Manual (Page 110)

KST-12000 Ku-Band Satellite Terminal Revision 4
Remote Control Operation MN/KST12000.IOM
A.2 Message Structure
The ASCII character format used requires 11 bits/character:
Version 1.13 Version 2.08
Start bits 1 1
Information bits 7 or 8 7
Parity bits 1 or 0 1
Stop bits 2 2
Messages on the remote link fall into the categories of commands and responses.
Commands are messages which are transmitted to the RFT-1200, while responses are
messages returned by the RFT-1200 in response to a command.
The general message structure is as follows:
• Start Character
• Device Address
• Command/Response
• End of Message Character
A.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
A.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-1200 which is connected to a common remote communications link must be
assigned its own unique address. Addresses are software selectable at the modem, and must
be in the range of 1 to 255.
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