USB quad serial convertors.
Tripp Lite USA-19HS-C USB-C to Serial DB9 RS232 Adapter Cable - 3 ft. (0.91 m) Keyspan, High-Speed (M/M), TAA
Cablenet 2m USB 2.0 Serial DB9/25 Converter
C2G USB 2.0 USB-C to DB9 Serial RS232 Adapter Cable - USB / serial cable - Black
USB to Serial Adapter 1.2m with FTDI Chipset USB to D9 Male
USB 2.0 Dual Serial Convertors.
USB to Serial Adapter
