Abstract: There is provided a system for remote monitoring a plurality of security systems connected to the Internet, the security systems being assigned dynamic IP addresses, each of the security systems comprising a remote monitoring server module, the system comprising a central alarm monitoring service connected to the Internet for periodically communicating with the plurality of security systems and determining a status thereof to generate an alarm signal as a function of the status, the alarm monitoring service storing a current IP address of the plurality of security systems in an IP address database, and a remote monitoring gateway providing authenticated or unauthenticated dynamic domain name service (DDNS) server functionality to connect a given remote monitoring client to a desired one of the security systems, the gateway being connected to the IP address database and to the Internet. There is further provided a method of remote monitoring a security system.

Abstract: Zones of a passive infrared (PIR) motion detector lens are staggered at close range to provide for pet immunity. In a dual sensor, dual lens configuration, the sensor signal is acted on to generate an alarm only when the sensor signal is simultaneous, indicating that an infrared emitting object big enough to cross both staggered zones of a zone pair has been detected. To further enhance sensitivity and immunity to noise, two dual element PIR sensors are arranged in opposite polarity with their elements vertically parallel. The sensor output is simultaneous and of opposite polarity, and noise can be suppressed by blocking like-polarity signals.

Abstract: The digital sampler circuit processes an output signal from a high gain analog amplifier having as input an infrared motion detector output signal and a negative low pass filtered feedback signal. The amplifier output signal is a substantially square pulse signal having an irregular frequency and duty cycle and has an average duty cycle indicative of a DC level and a slow change in the DC level of the detector output signal. The sampler circuit includes a detector circuit for detecting the amplifier output signal and discriminating at regular intervals a high/low state of the output signal, and generates a high/low feedback signal corresponding to the high/low state of the output signal detected. The high/low state of the output signal is analyzed over a predetermined number of the intervals to obtain a ratio value for producing an output digital signal sample value. The digital sample value is a measure of the DC level and the change in the DC level of the detector output signal.

Abstract: A data entry keypad assembly is provided for a system controlling a plurality of components. The keypad assembly includes a plurality of key zones arranged in an ordered matrix and each having a label identifier, and a plurality of key switches, provided in corresponding key zones. The keypad assembly also includes a plurality of light source means, each one of the light source means also provided in the corresponding key zones. Input controller connected to the key switches is provided for receiving data in the form of a sequence of key presses of the switches, and information displaying controller connected to the light indicator is provided for indicating a state of some of the components each associated with some of the label identifiers. When the data entry keypad assembly is used for a security system, it controls a plurality of detectors and warning devices, and displays a detection state of the detectors, while allowing activating/deactivating commands to be entered.

Abstract: 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 for generating an RP response signal, the receiver having a response to at least one of radio frequency (RF) or electromagnetic (EM) impulse signals similar to the parasitic response. An alarm output signal is generated in response to intruder motion in the predetermined area while preventing false alarms due to the parasitic response.

Abstract: The Doppler shift motion detector has an effective motion detection range which can be changed by changing the power level and thus without changing the motion detection circuitry. The Doppler shift motion detector also has a self test for the wave transmitter and receiver which can be carried out without requiring placing a moving object in the monitoring area. The Doppler shift signal generated when the power level is changed is used to check the detector for the self test and is ignored by the detector alarm output circuitry when the power level is changed. An anti-masking feature is also provided.

Abstract: The digital sampler circuit processes an output signal from a high gain analog amplifier having as input an infrared motion detector output signal and a negative low pass filtered feedback signal. The amplifier output signal is a substantially square pulse signal having an irregular frequency and duty cycle and has an average duty cycle indicative of a DC level and a slow change in the DC level of the detector output signal. The sampler circuit includes a detector circuit for detecting the amplifier output signal and discriminating at regular intervals a high/low state of the output signal, and generates a high/low feedback signal corresponding to the high/low state of the output signal detected. The high/low state of the output signal is analyzed over a predetermined number of the intervals to obtain a ratio value for producing an output digital signal sample value. The digital sample value is a measure of the DC level and the change in the DC level of the detector output signal.