KITUSB232485USB232485 is a non-isolated USB to RS-232 and RS-485 adapter. Available with Windows 98/2K/XP/Vista drivers.
This adapter plugs into standard USB ports and provides either RS-232 or RS-485 communications. It is provided with ~1 meter standard USB cable. Note: This is a single-port device, it does not facilitate the use of both RS-232 AND RS-485 at the same time.
(Proper RS-485 biasing must be used in accordance with manual.)