After looking at this project and the available driver boards. I am thinking of switching over to this:
RG60U-PCM
this allows for a non isolated 10 v analog signal. Would it be easier to generate this signal? I believe that is what MarkT was referring to in his post.
I'm thinking of using an OpAmp (I have never used one before) to amplify the voltage from 0-5v to 0-10v.
Fred or Mark any suggestions? thanks