Quote Originally Posted by Jonathan View Post
Similarly if the motor is connected wrong it'll either break, not spin at all or spin the wrong way.
No it will work fine but as you say spin in reverse, changing the pin hi/lo setting is what most folks do to get round this. But wrongly wired polarity of motor/drives is known to cause this kind of error, it comes up every so often on Mach Yahoo forum.! . . .Yes I know this is USB but still motor/drive issue so still possible.? Certainly worth checking as it's 5min job.!