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This modular adapter has a DB25 male connector that plugs into DB25 RS232 serial port and converts it to an RJ45 connection. RJ45 Pinout: Pin1 -- Blue Pin2 -- Orange Pin3 -- Black Pin4 -- Red Pin5 -- Green Pin6 -- Blue Pin7 -- Brown Pin8 -- White. Gold plated pin. 28AWG wire. Molded Gray, Green, Red color housing. Thumb screw