The diagram you sent previously (on June 29th) with the change that I suggested on July 2nd (moving the 120VAC to the PMDX-107's "Fwd/Run" terminal) should make this happen.
If you need help configuring Mach3 to use the PMDX-107, see our application note AN002 (PWM Spindle Speed with Mach3, SmoothStepper, PMDX-125 or PMDX-126 and PMDX-106 or PMDX-107) here:
http://pmdx.com/AppNotesIf you have any other questions, let us know.
Bob