The ADP example uses an SPI interface to stream the ADP data from the SAM D21 to the embedded debugger (EDBG) on the SAM D21 Xplained Pro board. The EDBG uses the Data Gateway Interface (DGI) to stream the data over USB to the host computer. If the target board did not contain a device with DGI capability, ADP could have been streamed directly to the computer over a serial interface. If this was the case the Serial Port Control Panel (Serial Port) would have been used in the Data Visualizer instead of the DGI Control Panel (Data Gateway Interface (DGI)).