SIIG’s 2-Port USB to RS-422/485 Serial Adapter instantly adds two industrial RS-422/485 ports to your USB enabled desktop or notebook computer. It allows users to connect any RS-422 or RS-485 serial devices via the DB9 ports and to conveniently switch between RS-422 and RS-485 devices with the auto detect and switch technology without powering down the system. This USB to RS-422/485 Serial Adapter is wall-mounted ready and USB bus-powered with no external power adapter required for easy integration into harsh industrial environments. Features - Add a USB bus-powered 2-port industrial RS-422/485 adapter to your USB enabled system - Serial communication speeds up to 1Mbps - RS-422 and RS-485 auto detect and switch - ±15KV ESD protection on all signal pins - Additional I/O or IRQ not required - LEDs for indicating TxD/RxD activity - Wall mount support.