Is Interlogic's THC a standalone unit? In other words, does it have it's own Z Axis Lifter? If it does, you can probably use it. If Interlogic happens to have it's on Z Axis Lifter, it's most probably that the THC is completely controlling the Z Axis, and there's no need for communication between the Galil Plasma CNC Control Unit.
Standalone THC Units are simple, because you do not need to worry more about the wiring between the CNC control unit and the torch.