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General Mach Discussion / Re: mach 3 axis not running as DROs
« on: January 05, 2016, 12:22:18 PM »
Just because I am a moderator doesn't mean that I know anything.
If you still occasionally get one axis going in the wrong direction then I would suspect that the axis direction signal is not being recognized correctly.
One cause could be that the voltage output from your computer’s LPT parallel port is to the 3.3volt TTL standard when your breakout board / controller is expecting signals which meet the 5volt TTL standard. If this is the case then fitting another PCI parallel port card (which does have 5volt TTL output) is probably the easiest solution.
Tweakie.
If you still occasionally get one axis going in the wrong direction then I would suspect that the axis direction signal is not being recognized correctly.
One cause could be that the voltage output from your computer’s LPT parallel port is to the 3.3volt TTL standard when your breakout board / controller is expecting signals which meet the 5volt TTL standard. If this is the case then fitting another PCI parallel port card (which does have 5volt TTL output) is probably the easiest solution.
Tweakie.