USB quad serial convertors.
Manhattan USB-A to Serial Converter cable. 1.8m. Male to Male. Serial/
USB C to Serial Cable 1m USB Type C to DB9 Male
StarTech.com 1 ft USB to RS232 Serial DB9 Adapter Cable with COM Retention
USB To Dual Serial Adaptor
StarTech.com 4-Port Serial PCIe Card, Quad-Port PCI Express to RS232/RS422/RS485 (DB9) Serial Card, Low-Profile Bracket Incl., 16C1050 UART, Windows/Linux, TAA Compliant - Level-4 ESD Protection
USB to Serial Adapter 1.8m with FTDI Chipset USB to D9 Male
