Originally Posted by mbam my memory is toast. |
is That the PC or yours?
just the existing in the cables from the controller card. I was a little nervous about doing that. But it can't hurt, right? |
I assume you are using the standard Galil 100 conductor break-out box for termination, if so, it might pay to try grounding all the terminals marked gnd to the common point. Don't forget if you rely on the common or ground terminals alone for the return path, and they are not directly grounded, they go through the card to the bus and then to a dc common, which may or maybe not grounded. It pays to physically trace and draw out all the return paths that exist and see how they all return to their respective commons.
I would suspect that somehow the low-level step and direction signal comming from the card has noise being impressed on it.
Al