No I am not mixing things up. The signals are used by teh controller to do teh THC functions via software. The controller itself controls the up,down, on,off ,slow down corner lock out, lock out down ,etc. That is when you are using an outside THC sensor modual . Been plasma cutting for over 20 years now with various systems.
LinuxCNC does not seems to have these things built in like other controllers you apear to have to BUILD an entire software controller from scratch compiling all teh moduals. That is pretty much out of teh question as I would want to USE teh plasma cutter not spend all teh time learning how to make a controller.
For instance I can take UCCNC and in about 2 hours have a fully functional plasma table cutting with THC and have all teh bells and whistles. I would not have to compile anything or figure out anything like the hal ini,etc. Simply set up teh configuration and go .
I don't see LinuxCNC being able to do that.
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TP