diff --git a/share/ax25/ax25.default b/share/ax25/ax25.default
index df743b7..ff7d146 100644
--- a/share/ax25/ax25.default
+++ b/share/ax25/ax25.default
@@ -1,10 +1,22 @@
 # Configuration for AX.25 systemd unit file from Pat.
 
-# The axport from /etc/ax25/axports to bring up
+# The axport from /etc/ax25/axports to bring up.
 AXPORT=wl2k
 
-# The AX.25 baudrate the TNC is configured for. (Make sure this matches the HBAUD setting of your TNC).
+# The AX.25 baudrate the TNC is configured for.
+# Make sure this matches the HBAUD setting of your TNC.
 HBAUD=1200
 
-# The TNC serial path
+# The TNC serial path.
 DEV=/dev/ttyUSB0
+
+# Script for initializing the TNC.
+#
+# This optional parameter is convenient when dealing with TNCs that require
+# additional initialization, e.g. entering KISS mode. Modify to fit your own needs.
+#
+#TNC_INIT_CMD="/usr/local/bin/my_tnc_init_script --serial-tty $DEV --hbaud $HBAUD"
+#
+# Example (for Kenwood TH-D7x and TM-D7x0):
+# Download, modify, compile and install http://www.trinityos.com/HAM/CentosDigitalModes/usr/src/misc/D710/tmd710_tncsetup.c
+#TNC_INIT_CMD="/usr/local/bin/tmd710_tncsetup -B 1 -S $DEV -b $HBAUD"
diff --git a/share/bin/axup b/share/bin/axup
index 9b2c83f..5e17b90 100755
--- a/share/bin/axup
+++ b/share/bin/axup
@@ -7,6 +7,10 @@ if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]
   then echo "Usage: $0 [tty] [axport] [1200/9600]"
   exit 1;
 fi
+
+# Init TNC (optional)
+[ -z "$TNC_INIT_CMD" ] || eval "$TNC_INIT_CMD";
+
 if [ "$3" -eq "9600" ]; then
   /usr/sbin/kissattach $1 $2 -m 256
   /usr/sbin/kissparms -p $2 -t 100 -l 10 -s 12 -r 80 -f n