See your product's hardware user guide for more information on the device's virtual serial ports and Universal Asynchronous Receiver/Transmitter (UART) interface settings. The virtual serial ports on a Nordic Semiconductor Development Kit (DK) are indexed from zero. Your computer's operating system maps each of the device's virtual serial ports to a unique, persistent serial port identifier for the device and computer. Serial Terminal lists the selected device's serial ports in ascending order of its virtual serial port index.
In the following example, the virtual serial ports indexed 0 and 1 on the nRF52840 DK are mapped to serial ports 10 and 11 respectively on the computer. In the log window of the image, you can see that the serial port "COM10" is associated with vCOM-0 (index 0) on the DK, and "COM11" is associated with vCOM-1.
Note
Serial ports are also referred to as COM ports on Windows, ttyACM devices on Linux, and /dev/tty devices on macOS.