Help Please With Auto Tool Height Mach 3 Problem

[howser37]

Thanks Clive, yeah that's how i read it as well. I have done some more testing just now by jumping the probe pin and the ground pin, first checked just pc parallel port with mach 3 on diagnostic screen (digitize goes out), then end of parallel cable that plugs into output of contol box (digitise goes out), then to 9 pin input of control box ( digitise goes out) all good so far. then traced the st cable back to the what looks similar to an audio jack on the side of the gantry where the probe plugs in, i plugged in probe to the port digitise led goes out(which i assume is correct as it is now making a circuit waiting for the circuit to be broken by the touch off. however pressing probe does nothing as usual, then tried completely different edge finding probe and again this does nothing, (digitise doesn't change on diagnostic screen.

I then gained access to the box containing the port that the probes plug into and jumped both pins with the wire attached to the top of this port (digitise changes as it should) so my thinking is now that there is something wrong with this jack internally?

Here is a picture