I hope you have a meter or access to one.
Printer cable quick check: With a meter on ohms make sure you can read pin 1 to pin 1, pin 2 to pin 2, and so on with all pins of the cable. If 2 and 3 are swapped you have a null modem cable.
I noticed the electronics forum here at CNC Zone has some posts relating to the G540 that might be able to help you.
Jeff |