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If no data is being input/output or serial port alarms are occurring.
Check the cable for proper connections. See Cable section below for cable diagram. Connect your computer up directly to the machine to eliminate cable junctions, switchboxes, etc.
Try communicating in the opposite direction than the one you are currently having trouble with.
If the control has another active port try communicating using it.
If you are having trouble with down/uploading on the PMC side try down/uploading on the CNC side (or vice-versa).
If you have a Fanuc communications device such as a Floppy Cassette or a Handy File, try to communicate to the CNC using it's standard setup.