Add an rs232 db9 or db25 serial port to your laptop or desktop computer with this plug and play usb to serial adapter cable the icusb232db25 3 foot usb to rs232 serial adapter 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 this high quality usbrs232 serial adapter cable is a cost effective solution that bridges the compatibility gap between modern comput