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.

An integrated building occupant protection system includes alarm units having a controller, one or more sensors, a timer, a transceiver, an audio alert device, and a communication device. When a sensor detects a threat, the audio alert device is activated. The transceiver transmits an event signal to mobile devices associated with the building occupants. The controller uses response signals from those devices to pinpoint the location of the occupants, which may be broadcast by the communication device. The mobile devices may be cellular telephones or pet collar devices. The system is configured to perform periodic self-tests. A system for generating revenue by selling promotional time following the system tests is also provided.

An apparatus is provided that includes a two-wire loop having first and second conductors that connect a monitoring system with a plurality of addressable sensors and alarm devices of the monitoring system, the two-wire loop having first and second ends connected to the monitoring system, a memory that contains first respective resistance values of the first and second conductors and second respective resistance values between the first and second ends and each of the plurality of addressable sensors and alarm devices, and a processor that detects a fault in the two-wire loop by measuring third resistance values from opposing ones of the first and second ends of the two-wire loop during a scan of the plurality of addressable sensors and alarm devices and compares the third resistance values with corresponding ones of the first and second respective resistance values in the memory.

An apparatus is provided that includes a two-wire loop having first and second conductors that connect a monitoring system with a plurality of addressable sensors and alarm devices of the monitoring system, the two-wire loop having first and second ends connected to the monitoring system, a memory that contains first respective resistance values of the first and second conductors and second respective resistance values between the first and second ends and each of the plurality of addressable sensors and alarm devices, and a processor that detects a fault in the two-wire loop by measuring third resistance values from opposing ones of the first and second ends of the two-wire loop during a scan of the plurality of addressable sensors and alarm devices and compares the third resistance values with corresponding ones of the first and second respective resistance values in the memory.

Supervisory signals from a first wireless security sensor are received at a first supervisory rate that repeatedly confirms that the first wireless security sensor remains operatively coupled to a security system controller. A first security sensor alarm is received from the first wireless security sensor and in response, the first supervisory rate is changed to a second, higher, supervisory rate. Supervisory signals are received from the first wireless security sensor at the second supervisory rate that repeatedly confirms that the first wireless security sensor remains operatively coupled to the security system controller. When a second security sensor alarm is received from the first wireless security sensor within a predetermined period of time after the first security sensor alarm, an alarm condition detection alarm is issued from the security system controller.

An alarm system testing device facilitates simulation of a trouble condition and testing circuit continuity of an alarm system within a structure. The device includes an alarm system comprising an electrical circuit, an alarm, a resistor, and at least one trigger. The alarm is activated by the trigger shorting a positive rail of the electrical circuit to a negative rail. A testing switch has a ground position wherein the positive rail of the electrical circuit is grounded when the testing switch is in the ground position. The resistor is electrically coupled to the testing switch such that positioning the testing switch in a resistor bypass position removes the resistor from the electrical circuit.

The present application is direction to a testing apparatus for use with a fire detection system having a plurality of base units. The testing apparatus comprises: one or more connectors, each of the connectors configured to be connected to a corresponding base terminal of a base unit; one or more first testers, wherein each of the first testers is configured to receive a voltage from a corresponding connector; a selector having a plurality of selectable configurations, each of the configurations defining a testing mode of the testing apparatus. Each of the first testers is configured to provide an output based on the configuration of the selector and the received voltage, the output indicating the connection state of a base terminal connected to the corresponding connector.