Thanks, I'll give it a try tomorrow.  I did see in the Vexta manual that it be 
connected as you suggest so I am hoping this is my problem and not a bad motor 
or drive as Jon alluded to (Thanks as well, Jon).
-Tom

> On May 4, 2015, at 8:41 PM, Peter C. Wallace <[email protected]> wrote:
> 
> Just to make sure its not a current drive issue, can you try connecting the 
> step and dir signals to the 7I85S such that the 7I85S sinks current to drive 
> the OPTO? The current batch of 7I85S's sink current better than source so you 
> would connect the OPTO + to 5V and OPTO- to 7I85S output to get maximum drive

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