Our shop has a very early Ez-trak, probably 1st generation, CNC mill that is only 2 axis, LED readouts and the only interface outside of the machine is a RS232 connection. I have tried to connect using a standard parallel to usb adapter and Bobcad, but keep getting a "connection failed" error message. Could I be using the wrong cable or the wrong DNC settings? Anyone else had success connecting to this old machine, and sending or receiving code?