Usb-to-industrial adapter dual port db-9 rs-232 usb to rs-232 adapter
supports windows 7 and vista (32 and 64-bit)
metal case with din-rail usb-2com-m usb to serial adapter (for industrial applications)
converts a usb port into a 9-pin x2 male rs-232 serial port capable of speeds up .
the usb serial adapter is designed to make serial port expansion quick and simple