hi hood, ill have a look at my wiring, the DRO does count up or down but no movement at all, the funny thing is that ive just tried it on another pc that was working fine and its doing the same on that, so to me it points to something on my wiring side of things having an effect on mach3! i dont have any limit switches active or anything like that as my machine is not built yet and its just on a bench for testing only.