... LED keeps lighting 1.5 seconds,then go to next step.knock 2 time to setup second digit"2",LED ... LED keeps lighting 1.5 seconds,then go to next step.knock 3 time to setup third digit"3",LED ... LED keeps lighting 1.5 seconds,then go to next step.knock 4 time to setup fourth digit"4",LED ... 5 seconds,then go to next step.knock 6 times to setup sixth digit"6",LED response 6 time;after 5 seconds LED keeps ...