Once the USB connector is first plugged into the DMX USB PRO and computer, the indicator LED should blink once to signify that it received power. Once this initial powerup has happened, the indicator light remains off until the device:

  • Blinks continuously: signifies DMX is being sent or received by the DMX USB PRO.
  • Stays on always (no blinking): signifies error mode, DMX USB PRO needs to be restored.
  • Stays off always: normal mode, waiting for software to instruct it to perform DMX operation.


An easy test to determine that the device is receiving power is to unplug it and then plug it back in, watching the indicator light. If the light flashes, the unit is receiving power.