A contact module is provided for an electrical connector. The step-up converter is connected to the resonant converter; the step-up converter and the resonant converter are each connected to the primary control unit. The device may be particularly applied to the manufacture of nanostructures. By detecting the marker chemical substances, the monitoring apparatus is capable of identifying the occurrence of an abnormal state, the type of abnormal state, the occurrence location, the extent of the abnormal state, and the like. The method comprises receiving system information including a specific identifier from a network, receiving a request message from the network, and determining whether or not to transmit a response message to the network in response to the request message based on the specific identifier included in the system information.