Kantronics KAM - Page 80

Chapter 7 - Commands and Messages
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once it has been translated to the asynchronous format; and likewise, asynchronous frames from
the host are transmitted on the radio channel once they have been converted to HDLC format.
The asynchronous protocol spoken between the computer and the KAM is very simple, since its
only function is to delimit frames. Each frame is both preceded and followed by a special FEND
(frame end) character, analogous to an HDLC flag. No CRC or checksum is provided, FEND {frame
end) is 300 octal or $C0. Hence a command to your KAM would have a FEND character, followed
by the "type" character, followed by data or parameters, and completed by another FEND charac-
ter. In order to include FEND characters as data, a special escape character FESC ($DB) is used.
FESC followed by TFEND ($DC) is translated to $CO; FESC followed by TFESC ($DD) is translated
to $DB.