Startechcom usb adaptor cables startechcom icusb2321f the icusb2321f 1 port usb to serial rs232 adaptor cable with ftdi chipset and com retention from startechcom converts an available usb 11 or 20 port into an rs232 serial db9 port to connect monitor and control your serial devicesthis compact adaptor features com retention allowing the same com port value to automatically be reassigned to the port if the cable is disconnected and reconnected to the host computer or if the system is