.. Switch off the power before wiring. .. DVP04TC-H2 is an OPEN-TYPE device and therefore 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 (e.g. key or specific tools are required to open the enclosure) in case danger and damages on the device may occur. .. DO NOT connect input AC power supply to any of the I/O terminals; otherwise serious damage may occur. Check all the