The main difference is the GS-DCX2 is a stand alone system that can detect the placement of the vehicles, one leaving and the one traveling down the conveyor. It does this by using 2 loop sensor points. The GS-DCX1 uses one loop sensor for detecting the vehicle off the conveyor and an input from the wash computer to find the placement of the one traveling down the conveyor. The GS-DCX1 needs a computer channel in place of the 1st sensor input. Where the GS-DCX2 works with actual placement of the vehicles without outside inputs. Both units control the conveyor by simulating a stop/start push button station for the interlock.