Interface from CNC to  PTHC-200DC,
CNC controller(2100,2300,2500)----------------THC
Output                                                     (To CNC)
pin18 lowspdIncorner-----------------------pin1 Exauto
pin2 torch up----------------------------------pin2 up
pin15 torch down----------------------------pin3 down
pin16 arc start--------------------------------pin4 IHSARCON
Pin13 24VG------------------------------------pin8 GND
………………………unconnected………pin5 EXARCON
Input
Pin4 arcfeedback-----------------------------pin6 Arctrans1
Pin13 24VG-----------------------------------pin 7 Arctrans 2