This modular adapter has a DB9 female connector that plugs into DB9 RS232 serial port and converts it to an RJ11 or RJ12 connection. RJ12 Pinout: Pin1 -- White Pin2 -- Black Pin3 -- Red Pin4 -- Green Pin5 -- Yellow Pin6 -- Blue * Gold plated pin * 28AWG wire * Molded ivory color housing * Thumb screw