Mb2hal speed irregular timing of reversing of spindle

I've tried at least 3 different ones with varying results from almost usable to totally useless. I get com errors regardless of the running state of the motors. The error rate is arround 40-60% and it bogs things down tremendously.
And it doesn't help matters that I'm trying to control 8 VFDs.

Ohh 8 vfds! It seems like everything has to be perfect for modbus to run error free. Have you tried an ociliscope to check the signal.

No, but I'm not sure how I'd need to hook it up, or exactly what I'd be looking for when it is hooked up. Although I think we might have gotten a new scope at work since the last time I messed with this. (The old scope was an ancient single trace POS. just this side of useless.) This would give me a good excuse to check it out and play with it a bit.