Marshall Electronics USB to RS-485/RS-422 Converter CV-USB-RS485
Amazon.co.jp: DTECH USB RS232 RS422 RS485 Converter Serial Cable 1.5m DC 5V Power Interface Made in USA Chipset CP2102 + SP485 Built-in USB RS-232 RS- 422 RS-485 Converter Adapter Bidirectional Communication Compatible with
USB-COMi USB to RS422/485 Converter ($52.50) : Saelig Online Store