USB to 4-Wire RS422 / RS485 Adapter / Converter – CommFront
USB to RS-422/RS-485 DB9 Serial Adapter/Converter Multi-1/USB COMBO – Envistia Mall
Tripp Lite USB to RS485/RS422 FTDI Serial Adapter Cable with COM Retention ( USB-A to DB9 M/M), 30 in. - USB / serial - U209-30N-IND - USB Adapters - CDW.com
USB to Serial Adapter - 9 Way (RS-422), 1m | $42
USB to RS485 | RS422 Optically Isolated Industrial Serial Adapter
USB to 1-Port RS-422 DB9 Serial Interface Adapter - Sealevel
4-Port RS-422 / 485 USB to Serial Adapter - Coolgear