AM882 works with Protune - but not with the ZPA5-INT BOB

[JAZZCNC]

It says in the manual that erratic movement can be caused by weak signal or interference. How can I check for this?

You'll need an oscilloscope to do it properly but chances are you have just got something wrong with wires or settings.
Your not trying to run this with a Laptop are you.?
Where did you get the PP cable.? . . It must be a straight thru cable not an old printer or serial cable.

Regards the motor tuning then that's nothing to do with Drive settings it's the control software sending out pulse's and if you motor tuning is set to high you could be getting stalling motors.?

This will most likely turn out to be something simple like dodgy wire or wrong settings. Would be very unlikely you'll have electrical noise issues. The drives clearly work fine has do motors so they are ok and wired correct.

It could be PC related like low voltage parallel port, unfortunately don't know anything about your BOB so unsure if it pulls signals high or not.?

Sorry can't be more help than this.!!

EDIT: Oh if your using Mach3 then try the PP driver test to check your PP port.
If still having trouble and can't see any thing else wrong with wires, drives etc then sometimes a reinstall can help. It's not unknown for Mach's XML file to get corrupted and cause daft issues like this.!!