My KISS TNC config (PK232).
[RADIO]
# Mandatory parameters
# Interface type
INTERFACE=KISS
# Serial port
PORT=/dev/ttyS0
# Serial port speed
SPEED=4800
# Optional parameters
# Modem speed, default is 1200
#SIGNALRATE=1200
# Enable/disable NWS WX bulletin and object gating from IS to Rf
# Disabled by default
#GATENWS=<y/n>
# Enable/disable BOM WX bulletin and object gating from IS to Rf
# Disabled by default
#GATEBOM=<y/n>
# Descripton of port; no default
DESCRIPTION=144.800MHz 1200Bd, AX.25 stack (KISS-TNC)
# Via used to send locally generated packets; default is WIDE1-1,WIDE2-2
AXVIA=wide1-1
# Digipeaters processed with WIDEn-n algorithm; default is WIDE1,WIDE2
WIDEN=wide1
# Blacklisted stations; they are not digipeated, not gated; default is NOCALL,N0CALL
BLACKLIST=nocall,n0call
# PHG string, do not mix with range; no default
PHG=3250
# Range value in miles, do not mix with PHG; no default
#RNG=<n>
# Enable/disable transmission; change it to PTTON=1 to enable trasmission; default is no
PTTON=1
# Gate locally generated frames to IS gateway; default is no
# Useful for rx-only radio ports
# Experimental, use carefully
#GATELOCAL=<y/n>
# Gate digipeated frames to IS gateway; default is no
# Experimental, use carefully
#GATEDIGI=<y/n>
# Beacon text; %v replaced with actual version string; default is %v
BCNTXT=%v (AIR)
# Enable/disable digipeater; default is enabled
#DIGIPEATER=<y/n>
# KISS TNC setup parameters 0...255; no defaults
# Use to setup TNC by DIXPRS
#TXD=<n>
#PPERSIST=<n>
#SLOTTIME=<n>
#TXTAIL=<n>
#DUPLEX=<n>
# Below these are the traffic shaping settings for gating messages
# From IS to Rf
#
# For advanced users only; do not change if you do not know how
# traffic shaping works and if you do not have good reason !!!
# Traffic shaping high treshold, default is 0.75
#TRAFFICHIGH=<fv>
# Traffic shaping low treshold, default is 0.5
#TRAFFIClow=<fv>