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6124790 |
System and method for filtering an alarm
A method for filtering an alarm can be broadly summarized by the following steps: The state of an alarm is read or determined over time, which creates a pattern of state transitions for the alarm....
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6037867 |
Plug-in type supervisory switch
A device for supervising movable articles or objects has a supervising member which can be attached thereto. The device includes a connector disposed in a housing. The housing includes an aperture...
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5973603 |
House/garage smoke detector
A house and garage alarm system is provided including at least one detector housing with a smoke and/or carbon monoxide detector situated therein. A power source is situated within the detector...
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5933077 |
Apparatus and method for detecting undesirable connections in a system
An alarm system includes a controller (20), a plurality of transponders (23-26), and a transducer (50) connected to one of the transponders (23). A voltage reference which is preferably earth...
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5923249 |
Door security system
An optional security system for monitoring door opening is designed to be plugged into the main board of a slot machine without any change of hardware or addition of extra switches. This security...
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5920259 |
Motion detection with RFI/EMI protection
A motion sensor has a parasitic response to at least one of radio frequency (RF) or electromagnetic (EM) impulse signals. The motion detection circuit for security systems has a dummy RF receiver...
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5909174 |
Control device, especially for vehicle braking light control
A control device is provided with a controllable element and a control unit that delivers an output signal which, when a control command signal applied to the input side is at an activating level,...
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5805062 |
2-wire optovoltaic loop-powered isolation amplifier with current bootstrapping
An isolation amplifier that transmits data to a receiver via a current loop, where the isolated portion of the circuit is powered by a photovoltaic array illuminated by a light source powered...
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5789925 |
Sensor system having abnormality detecting circuit for detecting abnormality of sensor system from outputs of signal processing circuits
A sensor system includes a single sensor means, two sensed signal processing circuits for processing the output signal of the sensor means, both the signal processing circuits being substantially...
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5777550 |
High reliability instrument system
A high reliability instrument system includes means for applying a test condition to the instrument and for determining whether the instrument properly responds to the test condition, and means for...
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5757265 |
Multiple-cable field bus system
A field bus system may be used in which transmission ability of the system can be maintained even if communication error occurs due to noises or failure of a transmission line. The system can be...
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5721530 |
Stand alone mode for alarm-type module
There is provided an alarm system for detecting and warning of the presence of alarm and trouble conditions in a plurality of zones. The system comprises a loop controller having supply lines...
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5701115 |
Field programmable module personalities
There is provided an alarm system for detecting and warning of the presence of alarm and trouble conditions in a plurality of zones. The system comprises a loop controller having supply lines...
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5694114 |
Coherent alarm for a secure communication system
A high speed secure fiber optic communication system that includes a coherent alarm system utilizes a pair of single mode fiber optic cables in combination with one or more light sources, phase...
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5679987 |
Method and device for obtaining connectivity information of telecommunication facilities
The invention discloses a method and its device for acquiring swiftly and firmly the connectivity information of electric conductor cords for connecting a plurality of apparatus groups or switching...
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5652566 |
Alarm system
A redundant alarm system including a central controller that interfaces with a first alarm, a second alarm, a visual indicator and an acoustic sensor. When an alarm condition exists, the controller...
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5640140 |
Alarm processing apparatus
The alarm processing apparatus has fault detection means which detect faults with regard to specific individual items, and which are provided in constituent elements, which have redundancy; fixed...
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5631630 |
Low voltage pool security system
A simplified, home-improvement-type, low voltage security system to prevent infants from entering the swimming pool area by monitoring the exit doors of a home leading to the swimming pool and the...
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5621383 |
Ring network system capable of detecting an alarm in each node
In a ring network system formed by a plurality of nodes connected to one another through a ring-shaped path, each of the nodes collects all of node information signals representative of states of...
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5619131 |
Parallel analog-digital monitoring system
An electronic monitoring system provides an actual value sensor which detects an actual value of a component to be monitored, e.g., the rotational speed of a drive motor, and emits actual value...
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5552764 |
Alarm detecting system for redundancy configuration circuit
In a receiving circuit which serves as a system in use, a gate circuit is enabled in response to a specifying signal. In a receiving circuit which serves as a backup system, a gate circuit is...
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5524099 |
Intrusion detector operating mode selection system
An intrusion detector operating mode selection circuit sets an intrusion detector operating mode responsive to an encoded acoustic signal. An acoustic signal decoder receives an encoded acoustic...
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5479161 |
Automatic calibration of redundant sensors
A system for calibrating the sensors of a redundant sensor system by calculating a first set of error signals based on differences between a combination of the outputs and known values and...
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5473309 |
Apparatus for testing an irrigation system controller and method of testing irrigation systems
An apparatus for testing the operation of an irrigation system is disclosed. The apparatus pinpoints defects in the irrigation system controller by simulating control signals and processing the...
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5448224 |
Heat detector including device for detecting abnormality of external temperature sensor
A heat detector includes an external temperature detector for detecting an external temperature outside the heat detector and an internal temperature detector for detecting an internal temperature...
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5424708 |
System and method for transferring hub alarm service monitoring
An alarm system monitoring method for remote monitoring. A local alarm monitoring station receives alarm indications from alarms being monitored, and transfers the alarm indication to a first hub...
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5416725 |
Computer-based notification system having redundant sensor alarm determination and associated computer-implemented method for issuing notification of events
A notification system for reporting events occurring within a defined area being monitored thereby. The notification system includes a plurality of sensors installed at selected locations within...
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5402101 |
Method for determining the configuration of detectors of a danger alarm system and for determining the system configuration of suitable detectors
A danger alarm system includes a plurality of detectors, each of which having a microprocessor, a current drain controllable by the microprocessor for data exchange with a central station, an...
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5387899 |
Alarm system with monitoring circuit for detecting a cut or short in a pair of wires
An alarm system is described wherein both an open connection between an alarm monitor and an alarmed unit or a short circuit across the connection between the monitor and the unit can be detected....
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5200734 |
Detecting and alarming system for detecting shortcircuited or broken circuit
A detecting and alarming system includes a main alarm circuit provided in a headquarter control center, at least a terminal alarm circuit provided at a local station, and at least a connecting loop...
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5155480 |
Event reporting using a two-wire non-blocking bus structure
An apparatus for non-blocking event reporting from event reporting units to a monitoring circuit includes a first and second common wire coupling the units to the monitoring circuit. A constant...
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5140622 |
Data transmission system with double lines
A data transmission system with double lines comprises a plurality of sensor terminals connected to the current line in cascade, and a controller connected to a current input side of the first...
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5140305 |
Speed sensor failure detection method and apparatus for an overspeed protection system
An apparatus for detecting speed sensor failure in an overspeed protection device is disclosed. The apparatus comprises a plurality of tachometers having outputs for indicating the speed of...
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5132628 |
Error detecting device for electronic equipment
A device for detecting errors of a plurality of electric parts which are built in electronic equipment has error detecting circuits in the form of relays. The relays are interconnected one-to-one...
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5103206 |
Security system
A security system including a plurality of alarm equipped security units usable at discrete locations and operated by individual power sources at those discrete locations. The units are...
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RE33807 |
Self-powered sensor for use in closed-loop security system
A self-powered sensor for a closed-loop security system includes a self-powered sensor network which provides a switch-actuating signal upon the detection of a physical condition. An electronic...
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5030939 |
Multiple input signal checking circuit
A circuit senses the conditions of control instrumentation such as valves and graphically displays these conditions on a display panel or screen of a console. The circuit also provides signal...
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4973943 |
Signal control system using two synchronous ring counter circuits
A signal control system for transmission circuits which includes two ring counter type transmission circuits respectively formed of a plurality of transmitter-receivers located opposite to each...
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4954809 |
Continuity-isolation testing for class A wiring in fire alarm system
A fire alarm system in which a large number of terminal units, comprising detectors and interface circuits, at a variety of locations are coupled or connected in separate, independent loops of the...
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4926364 |
Method and apparatus for determining weighted average of process variable
A method and apparatus for determining a weighted average of three input values under the control of a processor includes a step of determining which of the three input values is the median value,...
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4899131 |
Local control system for domestic appliances and alarm devices
A control system has a central unit for applying DC operating current and control signals to a two line bus. The central unit applies a DC operating current to the bus, as well as signals that have...
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4896141 |
Fire and overheat detection
An overheat detector comprises an optical fiber connected at one end to a light source and at the other end to a photodiode for monitoring the light level transmitted through the fiber. When the...
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4881058 |
Combined audible and visual alarm system
A combination audio and visual alarm system for selectively generating either audible, or visual, or combined audible and visual alarm signals, including a sound transducer device having a blocking...
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4857912 |
Intelligent security assessment system
An intelligent security assessment system includes a multiplicity of sens for detecting intrusion into an area. Each of the sensors operates on a different principle to detect intrusion. For...
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4849734 |
Self-diagnostic circuit for alarm-systems
A self-diagnostic circuit for use in alarm systems and the like, of the kind having a plurality of alarm detection switches connected in a loop, indicators associated with each of the switches for...
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4843378 |
Failure alarm device for an appliance
The failure alarm device for an appliance of the present invention include a first alarm for indicating an abnormality if an abnormality should occur in the appliance main body, and a second alarm...
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4833451 |
Individual source identification
An individual source identification of several signal providers or pick-ups with closable contacts disposed in a twin-wire signal line, in particular for fire detectors in fire alarm systems. The...
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4804942 |
Verifying automatic line integrity diagnostic (V.A.L.I.D.) apparatus and methods for intrusion detection systems
An intrusion detection loop employing an end-of-line resistor that operates with a voltage window. As the voltage window is increased, the sensitivity of the system decreases. As the window is...
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4803465 |
Apparatus for improving the reliability of an alarm circuit
An adapter module for converting a Class B alarm system to Class A operation. The module includes a first pair of terminals connected to corresponding terminals of a Class B control panel, and...
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4797670 |
Redundant signal selector system
The present invention relates to a signal selector which selects a signal for control of various operating parameters in a process facility. The system includes a display and first and second...
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