I have a 24vdc open collector proximity sensor that I'm trying to operate a relay with. When I connect the output of the sensor to the negative pole of the relay, the relay energizes when the sensor does NOT see an object in proximity, and the relay does not energize when the proximity sensor DOES see an object in proximity. The sensor appears to output ground when nothing is present and it outputs nothing when an object is present, which is the opposite of the desired behavior. The relay that I have to use does not have an open position pole, only a closed position pole. How can I reverse this behavior so that my relay will energize when the sensor DOES see an object? Thanks in advance.