The icusb232db25 3 foot usb to rs232 serial adaptor cable lets you connect 9 pin db9 or 25 pin db25 rs232 serial devices to your laptop or desktop computer through a usb port as though the computer offered an onboard serial port a cost effective solution that bridges the compatibility gap between modern computers and legacy serial peripherals this high quality usbrs232 serial adaptor cable is backed by startechcom39s 1 year warranty and free lifetime technical support usb to straight