Add an RS422/485 serial port to your system through USB; features COM port retention. The ICUSB422 6 ft Professional RS422/485 USB (Universal Serial Bus) Serial Cable Adapter with COM Port Retention lets you connect RS422 or RS485 serial devices to your USB (Universal Serial Bus)-enabled computer. The adapter features a 9-pin (DB9) male serial connector as well as dipswitch controls for easy port configuration, & requires minimal software. The RS422/RS485 USB (Universal Serial Bus) Adapter is fully powered via the host USB (Universal Serial Bus) connection & provides power to the attached serial device without requiring an external power adapter. COM Port Retention saves the assigned port settings, allowing you to disconnect & re-connect the adapter with little to no configuration required on the host computer.