From what I have been reading this controller only works with Mach3. I recently got my PM-940m-CNC in and was wondering the same thing and found my answer on the hobby-machinist forum.
How is the experience with the nMotion card? I just got my PM-940CNC and was advised it is problematic. The documentation is terrible and has Mach 3 and Artsoft's logo all over it but is half Chinese and the terminal in/out info is truncated. Mine appears to be dead on arrival as well. I am tracing power on the wiring now....