My small 3-axis mill is equipped with separate homeswitches on all 3 axes
and a switch for measuring tool length. All switches is active in open
state. (Open switch = true signal)

Now I would like to have automatic Z-axis touchoff using the last input
pin on my lpt-port and a touch plate but this will give an active state
with a closed circuit.

What signal and what G-code can I use for the z-axis touchoff ?

Ideas please.
/Niels


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