New Project with Mesa 7I96 and THCAD-05

Also, I was wrong. If you jog down so the torch is touching the material and then click the ohmic test button, the ohmic led in the GUI will light up. 
If it doesn't monitor ohmicsense.ohmic-on in halshow while doing that and see if it lights up.
Id that does come on Phill needs to tell you how to contact that pin in Plasmac so it is seen.

Ah yes the experts explain where I have been assuming the wrong operation. I thought is acted just like a home or limit switch. It does act like that in Mach or UCCNC. I will check that in the morning.

Ok I had a few minutes out in the shop I have a switch acting like the torch touching the metal. When closing the switch and clicking on the Ohmic test the Ohmic light does not come on. I do have Ohmic button enabled. When I push the Probe test button the Z moves down about 2" stops backs up and small amount sets the DRO to 0.1200 then backs up again and stops and sets the DRO to 0.00. If I push the switch it does nothing, just completes the movements above. I checked the circuit and the +24 volt supply and all looks as it should.
I did go through the homing sequence before doing any of the above actions.

Looking to find something I checked the input to the THCAD-5 with the switch closed shows about 19.4 volts. Looking at the write up for the Ohmic circuit attached below. the values for my board are in the file. I don't know if this is something but the voltage divider in my file is 4.9 and the write up show 32??
 

Tom,
I think the settings are correct originally
The way the ohmic3 code is written, it just accepts the raw data as inputs and there is no need to use a calculator that way. 
(We let the computer do the maths)
So the thcad frequencies should be set to the ones on the calibration sticker.
The thcad divider should be set to what is set on the  link on the THCAD board. It should be set to 1/32 so 32 is required here.
Provided the 390 k resistor is used in the ohmic sense circuit, the volt divider should be set to 4.9. This gives a full scale of 24.5 volts.
You need to check the isolated ohmic power supply is outputting 24 volts and adjust the calibration screw to achieve this.

The problem you have is that the ohmic-on output is not connected to the plasmac input. Normally this is done when you configure QTplasmac the first time. Today that is done in pncconf.

So revert the settings to what they were in custom hal and  add this to your main hal file

I think it should work then. I will let Phil chime in if I have got that connection wrong.

I have attached a PDF file with the results of adding the 2 lines from the post above, and some other info that I looked at.  Not sure as to how helpful it is be I am trying to get this wrapped up, it seems so close.