C2g usb 20 usb c to db9 serial rs232 adapter cable connect a serial rs232 device to a usb type c port product features add serial device support through a usb type c port reversible symmetrical usb c connector compact lightweight design product description this usb c to db9 serial rs232 adapter is an ideal solution for connecting a serial rs232 device to a usb type c port the adapter allows point of sale terminals serial modems industrial equipment and other serial rs232 peripherals