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Set the divider ratio on the board to 1/32 (Needed for Linuxcnc)
Use the thcad calculator here jscalc.io/calc/NTr5QDX6WgMThBVb
Use the plasma divider ratio of 24:1 (an Everlast Quirk) in linuxcnc
Leave the Everlast divider board as 16:1

If you are getting negative values you have bigger problems than config issues.
Check your encoder velocity in halshow, it should be showing around the 0 volt sticker frequency ( / 32)
With the 9 volt battery, it should show near full scale, Calculate what it should be by hand
 

Hello all. I'm having some issues with getting my THCAD-2 setup with the Everlast 82i. I'm pretty sure I have all the settings correct. I opened the Everlast and set the jumper to the 16:1 divider ratio (as suggested). On the THCAD-2 I used the 10:1 (W1 Up setting) and left the card divider on 1. I used pnfconf to configure the THCAD and got the following settings:

Arc Voltage Offset = 100200.0
Arc Voltage Scale = 0.000199

In Qtplasmac I'm getting a -20 voltage reading instead of 0 V. I set the machine to run a small bit of G code and measured the voltage coming off pins 4,6 from the Everlast. This is consistently getting ~4.5V when running at 40A cut power. When I connected a 9V battery to the I+ and I- directly on the THCAD-2 the power in HALSHOW is jumping all over the place. However, when I connect the wires from the plasma back to the THCAD, I get no indication of any voltage when running a job.

Any help you can provide would be greatly appreciated.