Help Please With Auto Tool Height Mach 3 Problem

[howser37]

Hi JAZZ, I set the probe to the z home/limit switch pin and sure enough when hitting the limit the digitize led changes, however when pressing the probe plate it does nothing.

The probe plugs into this machine via what looks like 2 core speaker cable and it plugs into a small contol box mounted on the side of the gantry.

I traced this back into the control box via a cable labeled as ST

I just did a continuity test to make sure both sides of the wire were making it through the control box and to the computer, this is about as far as my electrical skill goes lol.

Just so you know i was only using the auto detect in mach 3 as a means of testing, the digitize is setup on pin 15 and was when i bought the machine, the auto height worked when it was demonstrated to me and it has worked intermittently since and recently nothing.

Unless i have changed some other setting which could affect it.

I tried changing to low active on the pi as well, this makes the digitize come on when the probe is plugged in, so i assume it would make it go off if the probe was touched, but as usual there was nothing at all.

PS. also with low active set the auto tool height acted very strangely by seeming to come down one step at a time.