Hello every one is there a way to setup a touch probe on a serial port i have a Aerospace tb6550 driver and i can't figure out where to to setup a touch probe that makes contact electricly so that i can use a digitizing program with it. sinse this board dont have any way of connecting more wires to the parrellel port.

My board is an Aerospace TB6550 4 axis drive board HY-TB4DV-M
If some one could explain how and a diagram would be great thanks.
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