3、e is whenthehost certaindistancefromthe machineafterthedepartureof thehostwillautomaticallyalarm, and alarm occurs incan theuserthroughthe buttononthe alarm stateis clear, alsofromthemachine alsopresupposesthe disconnection detection inside, namely themaster-slave communication
4、 in normal state, theopportunity willbe a realtimefrom theinside signal uploadtheir tothehost andaccompaniedby light alarm.Analysisofthe datasendingandreceiving theworkprincipleandthe keyproblemsof implementationofthe systemtosolve thefinal performanceofthesystemisvalidated by