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PK-232 TECHNICAL MANUAL
AWLEN
PARITY
RESTART
CONMODE
TRACE
HID
BEACON
PACKET
RAWHDLC
HPOLL
PPERSIST
KISS
HOST
4.7.2
"KISS" TNC Special Characters
The special "KISS" TNC characters are:
FEND (frame End)
FESC (Frame Escape)
TFEND (Transposed Frame End)
TFESC (Transposed Frame Escape) $DD
4.7.3
"KISS" TNC Frame Structure
Each KISS frame or block of characters begins with a FEND (Frame End) character.
o
The next character is like the original PK-232 CTL character in that it defines
whether the following characters are data or commands.
o
The literal data or parameter value follows the CTL character.
o
Each block ends with another FEND character.
The FESC (Frame Escape) character is the pass character.
o
If any data character is a FEND, that character is translated into the two-byte se-
quence FESC TFEND (Frame Escape, Transposed Frame End).
o
If any data character is a FESC, that character is replaced by the two-byte sequence
FESC TFESC (Frame Escape, Transposed Frame Escape).
o
If any data character is a TFEND or TFESC, that character is not changed.
4.7.4
"KISS" TNC Commands
There are only six commands in the "KISS" TNC protocol.
4.7.4.1
TXDELAY: CTL = $01
TXDELAY in the "KISS" TNC protocol has the same meaning as traditional TNCs: it de-
termines how long the TNC waits between activating the PTT line and the start of HDLC
data.
The KISS command is:
n
where
is a binary number expressing TXDELAY in units of 10 milliseconds.
PK232TM Rev. A 5/87
8
0
TRANS
OFF
OFF
EVERY 0
ON
OFF
ON
ON
ON
$C0
$01
FEND CTL TXD
4-11
CHAPTER 4 – HOST MODE AND SPECIAL APPLICATIONS
$C0
$DB
$DC
n
$C0
FEND
Page 28
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Troubleshooting
