Flexible Communication: Designed for use with Bar Code Scanners, Time Clocks, Label Printers, Point of Sale Terminals, Receipt Printers, and more. Switch effortlessly between RS-232, RS-422, and RS-485 standards. Protect Your Devices: Optical isolation (2.5kV) and surge protection (600W) ensure your equipment is safe from electrical interference and voltage spikes. Effortless Port Configuration: The adapter is designed with external dip switches to set RS-232, RS-422 or RS-485 ports and different operation modes conveniently. COM Retention: COM Port is fully configurable, and after reboots, the port assignment is preserved. Adapter has LEDs for Power and TX / RX. Universal Compatibility: Works seamlessly with a wide range of operating systems, including Windows 10, CE, 98, 2000, XP, Vista, Linux, and MacOS. Plug & Play Simplicity: No need for external power, just plug in and start using. Includes terminal block, USB screw-lock cable, and driver disc for quick installation.