Siigs 1 port usb to rs 422485 serial adapter instantly adds one industrial rs 422485 port to your usb enabled desktop or notebook computer it allows users to connect any rs 422 or rs 485 serial device via the db9 port 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 422485 serial adapter is wall mounted ready and usb bus powered with no external power adapter required for easy integration