Are you trying to use a Torch Height Controller on a USB breakout board and having problems?
The lights for “Up” and “Down” are working but the Z axis is not moving in reality or on the DRO?
Sorry to tell you but the integral THC functions within Mach3 are apparently written into the parallel port driver and wont work unless your USB breakout has it written into its own software. Most of the Chinese ones we have seen do not have this built in. The only one we know about that does is the true genuine Smooth Stepper from Warp 9. Copies of this revolutionary device do not appear to have it built in.
So if you have spent hours on your CNC and got almost everything working and that last step fails you – the answer is probably your breakout board.