PMDX-126 and probing trigger, error

[keastab]

I have 4 G203v's, a pmdx-126 and mach 3 right now. Currently it was working fine, except for an occasional zero level trigger miss. Now I see the pmdx trigger but it never gets to the Mach3 pin 11 to trigger zero found. the board (pmdx triggers, well the little led goes on) but MAch3 doesn't see it is there something I need to redo to make it work? (yeah yeah, I know upgrade to another software, that's not going to happen yet since I haven't found one I like as well as mach3 that's not "dedicated to a specific type of card or computer like Mach4 or UCCNC.)

[Steve Stallings]

Try checking the Digitize signal on the Diagnostic screen to see if the signal really is seen reliably by Mach3.

If not, make sure that the probing circuit has a reliable ground. If you are relying on your cutting tool as part of the probe signal path, try attaching a ground clip directly from the PMDX-126 input terminal block to the cutting tool itself instead of expecting ground to pass through the metal parts of the spindle.