I've got it switched back over to PP control but I've still got nothing. THC in Mach is definitely on. I've got PP2 enabled and pin 15 mapped to Arc OK. When the arc is good, the ArcOK LED lights so I know the mapping is good.
If I ground pin 15, the ArcOK LED lights. If I then turn on the THC function in Mach, Mach should wait for an ArcOK signal before moving. Forget about even having a THC connected. If the THC function is on, Mach should wait for the ArcOK signal before moving, correct? I should be able to put pin 15 on a button and Mach should wait until the button is pressed before moving.
The only difference between the profile I'm using for testing this and the profile I used with a Sound Logic THC is that in my mew profile I have modbus enabled, but as I said, I'm now controlling the THC through PP2.
What else is there that could cause Mach to ignore the THC commands?