Add a Null Modem RS232 serial port to your laptop or desktop computer through USB (Universal Serial Bus). The ICUSB232FTN FTDI USB (Universal Serial Bus) to Null Modem Serial Adapter Cable (1 port) converts an available USB (Universal Serial Bus) 1.1 or 2.0 port into an RS232 Null Modem serial DB9 port, solving DCE/DTE conflicts directly, without requiring additional cross-wired serial cables or adapters.