User's Manual Part 6

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For those wanting to write their own software, the command protocol and some test
procedures are provided in this Section. The protocol definition is based on the T2000
CCI protocol, with specific extensions to support binary transmission and reception.
 For modem control of channel change, the BCD Channel Selection field in the
Edit - Options menu must be set to Enabled during radio programming.
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CCI Computer Controlled Interface
DTE Data Terminal Equipment (e.g. Computer,  data head)
RU Radio Unit
RXD Received Data
TXD Transmitted Data
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The DTE is connected to the RU via a serial port on the data modem PCB. Commands
are generated by the DTE, and responses or unsolicited messages returned by the RU.
There is a prescribed format for all messages, which allows transmission errors to be
detected.
Control of the RU is accomplished by the DTE sending a command sequence (a
“packet”) and receiving a response (a “transaction”). Unsolicited messages may origi-
nate from the RU.
The RU will issue a prompt character to indicate to the DTE that it is ready to accept a
new command. After issuing a command, the DTE must wait for another prompt before
beginning the next transaction. The prompt character is “
•
” (full stop, ASCII code =
$2E).
Messages directed to the RU will always be responded to, either explicitly by means of a
return message (“Ready” or “Error”), or implicitly, by just the prompt “
•
” being issued.
The RU will not originate a message: messages returned by the RU are for information
purposes only, and no reply will be expected from the DTE.
This protocol definition is based on the T2000 CCI protocol, with specific extensions to
support binary data transmission and reception.