The MDR-4 takes all the best features from the MDR-3 and packs them into a sleek, compact package. It accepts commands from Preston Hand Units connected via the rugged G4 wireless link and controls up to two digital motors and camera run/stop functions for film and video cameras. The MDR-4 automatically finds the span of the lens once each motor is plugged in, and each channel has its own three-level torque adjustment and direction switch to drive virtually any lens.
The Analog port lets you plug a Micro Force or broadcast-style control directly into the MDR-4, controlling the motor of your choice as configured in the HU3 Mode menu.
The Serial port connects to the Light Ranger 2, transmitting distance information wirelessly to the HU3 and Video Interface unit. Firmware updates can be loaded through the Serial port or the mini USB port.