This document provides introductory information on the electrical specifications, functions, and wiring of DVP-EH2-L/DVP-EH3-L. The program and instructions for DVP-EH2-L/DVP-EH3-L are compatible with the DVP-EH2/DVP-EH3 series. The document also includes guidelines for purchasing peripheral devices. DVP-EH2-L/DVP-EH3-L is an open type device that should be installed in an enclosure free of airborne dust, humidity, electric shock, and vibration. The enclosure should prevent non-maintenance staff from operating the device, and proper grounding is necessary to prevent electromagnetic interference.