Add a serial port with this USB C to serial adapter with COM port retention USB to Straight-Through RS232 DB9 Serial Adapter with high-speed 921.6 Kbps Baud Rate Compatible with Windows, macOS, and Linux Supports remote wake up and power management control: Converts a USB-C port into a RS232 DB9 serial port, giving you a cost-saving way to connect to serial devices The USB-C to serial adapter retains assigned serial COM port values in nonvolatile memory, allowing the same values to automatically be re-assigned to the adapter serial port, when reconnected