not sure if anyone can help me but ive just received my plasma (bought it s/h from fleabay) and it doesnt appear to have the cnc interface that it was described have, just wondered if it was possible to buy this as a part and fit it? or what my other options are, im aware that the thc systems out there use a device through which the hot lead is passed which picks up voltage, also there has to be a arc ok signal, im just looking to learn all about my options, i wasnt expecting to need to but looks like ive got to!!

Thanks for the help