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It looks like you still don't have the full filename, because you have more files with partly that name it didn't complete it fully. When you have: sudo apt install ./nomachine_8.15.3_1_amd64 press 2 times TAB and you'll likely see that you have more files with that name. Press one letter more of the file that you'd like to install and press TAB again and you'll see that it completes the filename until the end (.deb). Now it should install when you press enter

Try these:

Halshow has the reading fluctuating from about -3650 -> +3650 with no plasma source having power.

in linuxcnc, the arc reading sits at -29

Jumping the B input?

Confirmed - mesa i/o pin 10 is lighting up when I should get an arc-ok input from the plasma, but linuxcnc isn't showing this.

Current codes

 

May I know what was wrong with THCAD-300 so you decided to convert it? Just curious.

Thanks, Rod for your input. I guess i'll buy THCAD. CPC is hard to swallow. Simply expensive. Any options to get usable signals from machine internals in other way?
ArcOk should be easile obtainable from PCB, controls from Linux via relays to start plasma should be easy. THCAD-300 straight from the torch connector should be fine as well, isn't it?