Abstract: A control system is provided for a door positioning assembly having a door mounted on a track. The door is movable between an open position and a closed position. The door has a leading edge adjacent a door opening, an edge arranged to define a second opening, and a pass door pivotably coupled to the second opening. The control system includes a proximity detector for providing a door position signal in response to the position of the door on the track system, and a user input for providing user input signals including open inputs, stop inputs including signals provided by a stop button of a user-operated switch, and close inputs in response to user commands. The system also includes a plurality of sensors for providing stop input signals in response to the position of an object located within a detection zone adjacent the door opening, in response to contact between an object and the leading edge of the door, and in response to the position of the pass door.