Run a stepper from 2 DM542 drive

[A_Camera]

The user has provided no circuit diagrams so it is really hard to say which way to jump.

Yes, that's the key issue. We are all only guessing. I provided my solution, but yes, other solutions might be needed, we have no idea since we don't have enough information about his design. I was however very clear that the solution I proposed is what I use and it works for me, and I bet you that I could make it work with his driver also.

There are two documented possible ways of connecting the driver, in one case you bridge all the + to the same and switch all the - signals, the other way is what I am using, which is I think the most commonly used. Basically there is very little difference between them (I know that electrically the difference is huge), and both uses the same principle, but without knowing all the details of his solution it is impossible the say which is right and which is wrong.