Port 422

StarTech.com ICUSB2324852 2 Port USB to RS232 RS422 RS485 Serial Adapter with COM Retention

StarTech.com 4-Port Industrial USB to RS-232/422/485 Serial Adapter - 15 kV ESD Protection - serial adapter

StarTech.com 4-Port Industrial USB to RS-232/422/485 Serial Adapter - 15 kV ESD Protection - serial adapter