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Hey carlos, I actually have a RN04-N and it appears to be very similar to this. I have a small fiberglass board that I route the sensor through including a 1k resistor for logical 5v, black wire to 15k resistor to pin 4, other end of that resistor to pin 1 on optical isolator. Ground is blue wire to pin 3 and 5, which will then go to ground on the board. Brown wire will go straight to 12v pwr. Is this correct? I still have my printer in the mail, and Im hoping this will work for the chinese knock NPN inductive sensor.