RATGDO with Liftmaster Maxum JHDC

Hardware
1

I have a Liftmaster Maxum JHDC model GDO. This is a commercial style opener, as the door is very large and heavy. In the wiring schematic of the RATGDO, it shows two leads to use with these types of openers. RATGDO refers to them as Discrete Open and Discrete Close. That’s all the documentation says. I’m not sure what to do with that. Do I just plug those two leads in parallel with my Wall Control wires? I’m concerned with over-volting the board and frying the RATGDO. Does anyone have any experience with this type of GDO? I have attached some supporting docs of my setup.

RATGDO Wiring
RATGDO Wiring1159×732 87.3 KB

Wall Ctl Back
Wall Ctl
Wall Ctl271×503 34.6 KB

Wiring Diagram
Wiring Diagram666×860 75.4 KB

2

Bump.

I did some playing around with my setup, but was unable to get anywhere.

The Wall Control unit puts out 5-7 vDC. So There seems to be no issue with over volting the RATGDO. However, when hooking the RATGDO in parallel with the WALL CTRL leads, i did absolutley nothing.

So I tried using just a simple 18/2 bell wire using the SBC control, and I got no response as well.

Does anyone have any ideas how I should proceed?