I just took a quick look at the torch height control on the rutex page.
I think you want to do this within Camsoft. You'll need to find, or design, a capacitance sensor like described on the Rutex site. Convert this signal to a 0 - 10 volt analog input. Camsoft can then control the torch height with opto 22 outputs.
This sounds like a complex issue and I think that CamSoft should be consulted. If I remember correctly they already have macros setup to control a THC Unit. Give them a call and they should be able to help with the hardware.