Ian, I did not have the spindle relay function enabled but I enabled it and set it to output#1. I still have to response from the THC. I reloaded my 2nd port driver last night and it says its working. Anything else to look for?
OK but leave this enabled and set to output1 - because even when you find the problem the torch won't fire either from the button or from an M3 if you don't. It might say "Torch On" on the THC300 screen button but it's still a regular spindle start CW function (OEM 110) to Mach.
Switch to the diagnostics screen. What do you see happening to the output1 LED when you toggle the "spindle toggle" button?
Ian