You can duplicate the device state reflected by the USB PWR and USER LEDs by attaching external LEDs or any other circuitry to the four I/O pins on the AO/DIO connector.

Complete the following steps to connect an external LED or any other circuitry to the USB-6453 (OEM).
Note The current of each of the four I/O pins is limited by a 470 Ω resettable fuse to the 3.3 V internal supply. This configuration limits the current to approximately 5 mA into a single external LED with 1 V forward voltage. These pins are protected up to ±20 V. Leave the pins open if you do not use them.
  1. Connect the LED anode to one of the four I/O pins of the AO/DIO connector as the positive connection.
  2. Connect the LED cathode to any DGND as the negative connection.
    Figure 112. Attaching External LEDs to the USB-6453 (OEM)