FTDI USB to serial adapter with DB9 connector lets you connect RS422 and RS485 devices to your computer's USB port. Supports data transfer speeds up to 230 Kbps-double 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 Linux-works with most computers 3-year limited warranty