Startechcom usb adaptor cables startechcom icusb2321284 the icusb2321284 1s1p usb to serialparallel adaptor cable from startechcom 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 connectorsan innovative solution the adaptor cable features both a parallel and serial port that can be used simultaneously delivering serial and parallel data rates o