After a 1/2 year endeavor trying multiple circuits from several sources that are available that didn't quite work I finally have the completed DZ-2500C Panel Interface Circuit (PIC) boards. Here is a video test of the board that can interface with up to fifteen(15) DZ-2500C switch machines to be wired (white wires only) to a control panel.
I connected the DZ-2500C's white wire to the PIC board; powered both the DZ-2500C and the PIC board from the same source (black and red wires); and connected the momentary push button switch and the red and green LEDs (3mm 12v) to the PIC board. The tiny panel is representative of these component arranged on a much larger switch control panel.