RS232 USB to serial Female adapter cable 9 pins 2 row DB9 allows PC computer to connect RS-232 serial device that communicate through COM ports (Not 15 pin 3 row DB15 VGA monitor cable for video). Convert USB into RS232 Cable: directional 6ft USB to serial cable with standard USB Type A Male port and DB9 female serial connector (9 wire pinout: DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS, RI).