“StarTech.com USB to Serial Adapter – 2 Port – RS232 RS422 RS485 – COM Port Retention – FTDI USB to Serial Adapter – USB Serial – Add RS232, RS422 and RS485 support to your laptop or desktop computer via USB – USB to RS232 RS422 RS485 – USB to Serial – USB to DB9 – USB to serial Adapter – USB to serial port SERIAL ADAPTER WITH COM RETENTION” has been added to your cart. View cart