When the USB TAP probe is powered on, it performs a brief self-test that displays a test pattern on both the Run/Pause and Transmit/Receive LEDs. After the self-test completes, the transmit/receive LED (labeled TX/RX) indicates the state of the USB interface as follows:
- The LED flashes red when the USB TAP probe is powered but has not been configured.
- The LED flashes green when the USB TAP probe is properly configured.
- The LED flashes orange when data is being transferred.
- The LED is unlit if the USB TAP probe is disabled or disconnected.