Add one rs232 serial and one ieee 1284 parallel port to your computer through a single usb connection the icusb2321284 1s1p usb to serialparallel adapter cable enables you to connect db9 rs232 serial devices and ieee 1284 parallel devices to your pc or linux laptop or desktop computer through a single usb port as though the computer offered onboard connectors an innovative solution the adapter cable features both a parallel and serial port that can be used simultaneously delivering seria