The YA-AUM328522 USB to RS-232/RS-422/RS-485 Serial Converter Adapter provides an external
plug-and-play serial connection with your computer, let you free up your
existing serial port. Users have the capability to utilize the adapter with
serial port interface in an easy-to-use environment. Installation is
easy .Simply plug a serial device into the adapter and plug the USB port into
the computer .NO IRQ is needed so there are no IRQ or Com port conflicts.