dash trash wrote:
From memory, all you need is to connect pin 3 and pin 5 (gnd) of the
serial port to your Tillerpilot. Your software should do the rest.

Dennis

The serial port is being used. That is why I ask if I can splice into
the wire.

You break into the plug, not the port! If the plug is moulded, cut the wire
and buy one of the self-assembled plugs from Radio Shack (US), or
Maplin(UK). You can use the existing wire if there are 5 or more strands
inside the casing, failing that, buy some 6 or 7-strand data lead.

Dennis.