Adds four high-speed RS-232/422/485 serial ports via USB connection. Supports USB 1.1 and USB 2.0 transfer speeds from 1.5 up to 480 Mbps Each serial port supports 5-pin screw-lock-type terminal block connector. AC to DC-12V, 1A switching power supply included Virtual COM port drivers available for Windows 10, 8.1, 8, 7, Vista, 2003, 2000