Siig, Inc. 4-port Industrial Usb To Serial Adapter Cable Adds 4 Rs-422/485 Ports To Desktop

4-port industrial usb to serial adapter cable adds 4 rs-422/485 ports to desktopor laptop systems, serial port data rate up to 128kb/s, 15kvdc esd, 3kv opticalisolation, plug-and-play, usb bus power, auto data direction flow control