StarTech.com 6ft RS422/485 USB Serial Adapter w/ COM Retention - Add an RS422/485 serial port to your system through USB; features COM port retention - USB to Serial - usb to rs485 - USB to DB9 - usb to rs422 - USB to serial Adapter

Supports RS-485 Auto Transceiver Turn Around by Unique Featured ATTA Hardware Integrated adapter and cable eliminates the need for additional cables Configurable port for RS422 or RS485 support Supported baud rates from 300bps to 921.6 Kbps Two interface modes; 4 wire RS422(TxD+/-, RxD+/-), and 2 wire RS485 (DATA+, DATA-) Being able to rename devices no matter how many are plugged in 120 OHM terminator that can be Enabled/Disabled by DIP switch Supports COM Port retention Backwards compatible with USB 1.1 USB to Straight-Through RS422/485 Serial Adapter