Mine only has the single trigger, but also has two limit switches at either side (it's a screw drive). I figured out that by flipping the limit switches I can c

Mine only has the single trigger, but also has two limit switches at either side (it's a screw drive). I figured out that by flipping the limit switches I can control the direction of the door using just the single trigger button. E.g., if I short the open limit switch and send the door move signal, it will always close.