The present disclosure relates to a method for resetting life diagnosis alarm of a contact of a contactor, including the following steps:

Step A: detecting a reset signal by a microcontrol unit;

Step B: when the microcontrol unit has detected the reset signal, checking the state of the diagnosis alarm through the microcontrol unit;

and when the diagnosis alarm is in an active state, the microcontrol unit: Step C: controlling the indicator to give a first indication signal for confirming a reset operation of the diagnosis alarm; Step D: resetting life diagnosis data; Step E: controlling the opening and closing of the contact of the contactor through an actuator.

A tool for performing diagnostics on a fire detection system includes an induction coil which includes two halves that may be selectively opened and closed to surround a wire in the system and sense current through the wire. A diagnostic module and a conduit provide communication of data of the sensed current between the induction coil and the diagnostic module. The diagnostic module is configured to decode the data to interpret communications sent through the wire.

A tool for performing diagnostics on a fire detection system includes an induction coil which includes two halves that may be selectively opened and closed to surround a wire in the system and sense current through the wire. A diagnostic module and a conduit provide communication of data of the sensed current between the induction coil and the diagnostic module. The diagnostic module is configured to decode the data to interpret communications sent through the wire.

This disclosure pertains to a system and method configured provide entry check-in protection of a protected premises network including a central alarm monitoring station in communication with a plurality of protected premises, each protected premises comprises a protected premises panel configured to provide entry check-in protection. Protected premises panels include processors and memory configured to provide entry check-in protection comprising receiving an indication of a zone violation of the monitored premises, transmitting a check-in message to the central alarm monitoring station, and transmitting an alert, by the central alarm monitoring station, indicating a destruction of the protected premises panel, upon expiration of the predetermined entry delay period. The check-in message includes a duration corresponding to the entry delay time plus a set period, e.g., one minute.

A system and a memory device including a driver circuit, to perform first operations including driving a resistor-capacitor (RC) sensor circuit of an electronic device to a drive voltage using a representative copy of a current that drives an electronic circuit line of the electronic device. The system and memory device including the RC sensor circuit, coupled to the driver circuit, to perform second operations including determining a first sample voltage by sampling a first representative voltage generated at the RC sensor circuit, and determining a second sample voltage by sampling a second representative voltage generated at the RC sensor circuit. The ratio of the first sample voltage and the second sample voltage is indicative of an RC time constant of the electronic circuit line.

Various embodiments include a method for operating a hazard notification system including a plurality of notification appliances connected to a bus system, each notification appliance having a signal element and an activatable energy consumption simulation unit comprising: receiving a switchover telegram at each notification appliance; attaching the respective energy consumption simulation unit of each notification appliance to the bus system in place of the signal element; measuring an energy consumption resulting in the bus system due to the activation of each energy consumption simulation unit in the course of a load test; comparing the measured energy consumption with predefined comparison values; and generating an alarm signal or a fault message as a function of the result of the comparison.

In an optical fiber monitoring system which detects physical disturbance or other parameters such as temperature or strain of a fiber where a monitor signal is transmitted along the optical fiber and analyzed to detect changes which are indicative of an event, a method is provided for periodically checking proper operation of the optical fiber monitoring system. A fiber disturbance actuator periodically causes a pattern of disturbances of a portion of the fiber at a predetermined location thereon where the disturbance is characteristic of the event to be monitored. The monitor signal is analyzed to detect the pattern of changes and in the event that expected changes are not detected, a warning is issued that the intrusion detection system is not properly operating.

A resistor-capacitor (RC) sensor circuit includes an integration capacitor configured to integrate a representative copy of a current that drives an electronic circuit line. The integration capacitor is configured to integrate over a first time period to generate a first representative voltage and over a second time period to generate a second representative voltage. The RC sensor circuit includes a sampling circuit coupled to the integration capacitor and configured to sample the first representative voltage and the second representative voltage. A ratio of the first sampled voltage and the second sampled voltage is indicative of an RC time constant of the electronic circuit line.

The RC sensor circuit includes a driver circuit that includes an output configured to drive the RC sensor circuit to a drive voltage using a representative copy of a current that drives an electronic circuit line. The RC sensor circuit includes an integration capacitor. The integration capacitor is configured to integrate the representative copy of the current over a first time period to generate a first representative voltage and over a second time period to generate a second representative voltage. The RC sensor circuit includes a sampling circuit coupled to the integration capacitor. The sampling circuit is configured to determine a first sample voltage by sampling the first representative voltage and a second sample voltage by sampling the second representative voltage. A ratio of the first sample voltage and the second sample voltage is indicative of an RC time constant of the electronic circuit line.

In an aspect, a fire detection system is described. The first detection system may include isolation circuit having an isolation switch coupled with a system line of the fire detection system and configured to isolate a first side of the system line from a second side of the system line. The isolation circuit may also include a controller coupled with the isolation switch which determines a time delay for determining to isolate the first side from the second side.