This question is almost a year old - is it answered elsewhere?
I'm having the same problem. A call to Tech services got me going but it seems every morning it's the same old thing. Sometimes it works but usually not. I re-check the port assignment (B000-B004) and try and re-try to connect.
The machine is grounded from the grate to the building's ground rod with a #8 insulated wire. The computer, controller and the Plasma cutter all all on seperate circuits. I've disconnected the parallel cable, powered down/up, rebooted and just about everything else I can think of.
Frustrating. It worked yesterday!