The wiring of the door control is not difficult.
I will include a TinyCAD diagram and an image of same.
There are 3 wires from the computer to the door, one is
12VCD positive ant the other two connect to the relays
Essentially, the relays at rest connect both terminals of the motor
to negative 12V. Pushing any of the momentary switches connects that
side of the motor and drives the door. Activating a relay will connect
the motor and move the door also. The limit switches are set so the
positive voltage on that lead will be blocked and the motor stopped for
that direction but negative current can flow to move the door in the
other direction. Click on this sentence for a TinyCad drawing.
click on the drawing for the full page.
