GPD Global | https://www.gpd-global.com/pdf/doc/Dispense-System-Service-Guide-22290008G.pdf
encoders and serves to define where the gantry is for the system. The homing sequence: 1. The gantry moves in Z axis to the Home sensor, and then moves to the index mark. 2. The gantry moves in Y axis to the Home sensor, and then moves to the index mark. 3
