Quote Originally Posted by Gary View Post
I just had an email from Bruce, and it apears that his clock pulse is about 3.3V, and he is using a laptop.
This is most definately the problems, and is actually quite common when a laptop is used.
The solution would be to use either another laptop with higher voltage outputs, or a desktop PC with a parallel port.

Bruce,
Try this and give us your results.

Thanks

Gary
What breakout board is he using? The MDS drivers are optisolated so dont really need a sophisticated BOB and are pretty immune to cross-over noise on the signal lines due to the low impedance 'on' drive. Unless he has a very long cable from PC to BOB or the BOB is a old design with TTL rather than CMOS logic I'd be suprised that the use of a laptop was an issue.