Supports data transfer speeds up to 230 Kbpsdouble the speed of a built-in serial port Automatically reassigns COM values to each port to avoid additional configuration USB-powered, so no bulky or obtrusive external power supply is required Double shielding protects against EMI/RFI line noise that can distort or destroy data Compatible with Windows, Mac and Linuxworks with most computers Connects a Printer, Router or Other DTE Serial Device to Your Computers USB-A PortThis 30-inch USB to RS485 adapter cable turns your computers USB port into an RS422 or RS485 serial port and avoids the expense of upgrading your reliable serial devices. No external power source is needed. Just connect the cable to your computer and insert the included CD into your computers CD drive in order to launch the driver and assign the cable a COM port. It supports USB 2.0 specifications and data transfer speeds up to 230 Kbps, which is almost twice as fast as a built-in serial port. It is backward compatib