Be gentle - first post here ... :)

I have a Sieg KX3 running on a parallel port via Mach3, and was wondering
a) what are the pin connections for the 1/4" jack for the probe?
b) is there a way of making a rudimentary probe?
c) how to then set up Mach 3 to use the probe?

Documentary info, both on the KX3, and Mach 3 all seems a little vague/non-existent that I can see regarding this matter.

Thanks in advance for the help :)