ATEN USB to PDA/Serial (DB9) Adapter w/ PC & Mac Drivers - Newegg.com
Aten USB to RS-422 485 Adapter (UC485)
Aten Uc232a Usb To Rs232 Db 9 Pin Pda Serial Db9 Port Adapter Pc Mac Drivers Usb-a Type Convert Rs-232 Serial Interface - Pc Hardware Cables & Adapters - AliExpress