Comtech EF Data KST-2000A/B - Manual (Page 112)

Ku-Band Satellite Transceiver Revision 9
Terminal Mode Commands MN/KST2000AB.IOM
B–2
B.2 Message Structure
The ASCII character format used requires 11 bits/character: 1 start bit, 7 information bits,
1 parity bit (odd/even) and 2 stop bits, or 1 start bit, 8 information bits with no parity bit
(none) and 2 stop bits. The default format is 7 information bits, even parity, and 2 stop
bits (7,E,2). Messages on the remote link fall into the categories of commands and
responses. Commands are messages which are transmitted to the KST-2000A/B, while
responses are messages returned by the KST-2000A/B in response to a command.
The general message structure is as follows:
• Start
Character
•
Device Address ‘add’
• Command/Response
• End of Message Character
‘cr’
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 KST-2000A/B 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 0 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.
KST-2000A/Bs which are connected to a common remote communications link must be
assigned their own unique address. Addresses are software selectable and must be in the
range of 1 to 255.
Notes:
1. ‘add’ is used to indicate a valid 1 to 3 character device address in the range
between 0 and 255.
2. Global address ‘*’ is reserved for EXTERNAL KEYPAD (KP-10) commands.