Home » Knowledge Base » NAUTIZ X8 Pinout for lower COM-portNAUTIZ X8 Pinout for lower COM-port See the pinout for the lower COM-port on the Nautiz X8 below. Pin 2 – Rxd Pin 3 – Txd Pin 5 – GND Pin 7 – RTS Pin 8 – CTS Other Pins – Opened