these units will cycle the doors when ever one of the following is opened. Hw lock, DCL, or Gate sw. DR. Note, the damn stroke adjustment on the door operator can allow the car door to "drift" off the dcl sensor. Then the doors will cycle. or HW door lock. The stroke adjustment on the hd85 operator,well, all Dover operators, needs to be strong enough to hold the door shut when there is no power on it.