The DMX512 Inline Optical Isolator is designed to plug directly into the back of most DMX lighting consoles. Its primary purpose is to protect the console from hazardous voltages which may travel on the control cable. Hazardous voltages may be caused by dimmer failures, electrical storms, and cross wiring non-DMX equipment (foggers, intercoms, arc welders) into lighting control outlets. The isolator also eliminates ground loops and provides high drive current for long control runs. NOTE: The input circuit of this inline isolator is passive and will not work with some DMX512 output circuits, specifically "slew-rate limited" circuits. Slew-rate limited applications require the active input circuit of our DMX Isolation Amplifier