Hi,
I am ready to blow a gasket as I bought this machine cause the old manual version of it has been flawless for 15 years.
That is common if you are just setting out with CNC, get used to it. I live in New Zealand, about 8000 nautical miles from you and I cant hear you shouting, YET!
When I can I'll know that you are really struggling.
How about asking for a detailed wiring diagram? You might remind them that they sold this machine and if it doesn't work as they advertised it would that you'll take them to court and
get your money back. That usually makes them sit up an start to take the problem seriously.
Can you open the covers and take some pics of the G540 and in particular the parallel input cord that goes back to...where...is it another board or direct to the PC. What is the PC?
Is it a parallel port output or what?
Craig