mesa thcad wiring

I searched this site and searched the www for instructions on wiring the mesa thc card into my hypertherm 45 with no information available. I looked at the manual and it shows the 7 pins on the back of the 45 is this were the thcad is wired in?
I have a box I bought with the 45 that is a remote start has 2 pins in the connector that attaches to the back of the hypertherm. Can this remote start cable be used for starting and thc? It only has 2 pins can more pins be added? It does come apart.
Also just how does the torch start cutting? What turns it on? Ive got the cover off the 45 looking it over. I have seen a drawing my brother found that shows where the thcad card hooks to the 7i76 and shows wires going to the torch but no instructions. And where does the thcad card get its +5vdc and -5vdc, from the 7i76? Im lost at this point. Anyone can clue me in please help. thanks in advance.

I don't have a Hypertherm so my pinouts will be different to yours so I called them X & Y
So to get your ArcOk working and assuming Hypertherm has a set of dry contacts (eg a relay) take a wire from your +24 volt power supply and connect it to one ArcOk pin. Connect another wire to your AcrOK pin (arbitrary one you choose) and run it to the other ArcOK connector pin. Connect a 1k 1W pulldown resistor from your input to -24 volt ground. Thius will ensure that current throuh the dry contacts exceeds the minimum relay current rating. SO wht hapens then, your plasma wiull get a good arc, turn the relay on and it wil switch 24 volts to your input where Linuixcnc will see it.

I forgot that you have a 50:1 divider. That gives you about 7 volt full scale which will still be OK for Linuxcnc to see. IF you need greater resolution a signal amplifier might be able to push it to THCAD 10 volt full scale.