This function is used, when you connect an electric strike or electric magnet which needs power supply to remain in locked state. Procedure: -insert the master code and press the Enter key -insert 5 and press the Enter key (5 is function - Negate / switch output state) -insert 1 and press the Enter key (confirmation of the function) -if it is successful, the Lokus will confirm it with two beeps and output state will instantly change