Abstract: The present invention involves a module on a single board for a power line control system including a transmitter circuit, a receiver circuit, and a control circuit. The transmitter circuit sends signals over the power line. The receiver circuit receives signals sent over the power line. The control circuit couples to the transmitter circuitry and the receiver circuitry. The control circuit includes a microprocessor and associated memory. The memory includes instructions enabling the microprocessor to interpret the received signals, generate transmit signals, and control the circuit which controls the electrical appliance. The receiver circuit includes feedback for attenuating the input signal to the receiver circuit. The microprocessor includes an output signal for attenuating the input signal to the receiver circuit. The memory includes programmable memory which can be FLASH memory. The memory also includes serial EEPROM.

Abstract: A system and method for remotely powering an Ethernet network repeater through an attachment unit interface (AUI) between the repeater and a remote personal computer (“PC”) or workstation. The AUI includes logic circuitry to detect when the Ethernet is supporting a transmit signal and a receive signal. Associated with the AUI is a DC to DC converter which receives, remotely through the AUI interface, a DC voltage from the PC or workstation and converts the DC voltage into working voltages for the remote repeater.

Abstract: The invention concerns a control device for the emission of carrier currents on a low voltage network, comprising a sensing module (1), by magnetic coupling, for generating from carrier currents detected high frequency signals (shdf), a local oscillator (2) generating a reference frequency radioelectic signal (fr) of a frequency comprised in the signal band (shdf) and a frequency-changing module (3) delivering an audio baseband signal (sbb) based on the (shdf) and (fr) signals. A demodulating circuit (4) delivers a detected low frequency signal (sdbf) based on the baseband signal (sbb) to a transducer circuit (50, 51) generating a sound signal controlling the current carrier frames. The invention is applicable to the implementation and management of current carrier installations on low voltage networks.

Abstract: The transducer supply is configured for supplying a passive transducer arranged in an explosion-hazard zone with electrical energy from a DC voltage source. The electrical energy is transmitted via a two-wire connection, via which in the opposite direction the measured value sensed by the transducer is transmitted by the transducer setting the direct current obtained from the DC voltage source to a value variable between two limit values. As a means of protection a transformer is inserted in the two-wire connection which affects DC decoupling. The direct current is chopped in accordance with the principle of a DC voltage converter at the primary side of the transformer and re-rectified on the secondary side.

Abstract: An electrical interface for connecting a truck electrical system to a trailer electrical system. The electrical interface includes a solid-state switching device for selectively connecting a power source in the truck electrical system to a circuit in the trailer electrical system. If a fault is detected in the provision of power to the circuit in the trailer electrical system, the solid-state switching device reduces the flow of power or disconnects the power source from the circuit in the trailer electrical system. A microcontroller system connected to the truck electrical system transmits control signals to the solid-state switching device to control the flow of power from the power source to the circuit in the trailer electrical system in accordance with instruction signals received from the truck electrical system.

Abstract: A signaling and/or help request system. A remote transmitter transmits an alarm signal which is received by a receiving/convening device which cooperates with the transmitter. The receiving/conveying device is fitted to a street lamp to transmit a message including an identification code to the electrical supply means. a receiving unit connected to the supply means extracts the messages supplied by the receiving/conveying device and supplies them through a network to a centralized receiver to generate a help request output signal.

Abstract: A transmission of information takes place between a scanning unit of a position measuring system and an evaluation and power supply unit connected therewith through a power supply line which connects the scanning unit and the downstream-connected evaluation and power supply unit. The transmitted information relates, for example, to the position-dependent analog scanning signals generated by the scanning unit.

Abstract: Typical apparatus according to the present invention for detecting a predetermined type of condition (such as the presence of smoke) at a given location and providing an indication (typically audible and/or visible) of the presence of such condition, comprises an electrical detector responsive to the type of condition, for providing a potential difference of at least a predetermined amount between two predetermined points; first circuitry for connecting at least a substantial fraction of the potential difference to an electrical relay or relay analogue in the apparatus so as to provide a predetermined first indication; and second circuitry responsive to a condition in the detector or in the first circuitry that is outside of a predetermined range, and thus of possible detriment to the optimum performance of the apparatus, to provide a predetermined indication.

Abstract: An expandable and modular intercom and annunciation system includes a plurality of signal sources, such as smoke detectors, breakage detectors, intrusion detectors, telecommunication detectors (such as ringers), and gas detectors. The system further includes a plurality of originating interface modules, each respectively coupled to a signal source for receiving signals from the corresponding plurality of signal sources and for converting the signals to common communication protocol signals. The system also includes a receiving interface module coupled to the plurality of originating interface modules for communication via the common communication protocol, and an intercom and annunciation unit coupled to the receiving interface module to receive the common communication protocol signals. The intercom unit has a processor, a memory, and a user interface including an audio output.

Abstract: An electronic intrusion detection system for monitoring environments having at least one electronic sensor responsive to movements occurring in the environment and adapted to modify at least one characteristic of its electrical output in response to the presence of a moving body in the environment. An alarm is signaled when the modification meets a predetermined condition. A transducer is provided for continuously converting the modification of the output from the electric sensor into a signal that can be perceived by a human being. An alarm control unit connected to the alarm and transducer forwards the signals to the surveillance personnel through a telephone line.

Abstract: A system for detecting and reporting a defect in a telephone line includes a network of utility processors that communicate over a power line. Each utility processor monitors a telephone line connected to the processor. The utility processor includes a processing element, a line sensor, a telephone interface and a power line communication interface. Each utility processor reports a defect in the telephone line by sending message to a second utility processor via the power line. The second utility processor reports the defect to a central office via a telephone line.

Abstract: A fire alarm system has detecting devices and alarm devices connected in parallel across the same supply lines. A control unit (CCU) supplies a first voltage to operate the detecting devices and a second higher voltage to operate the alarm devices. When a fire is detected, signalling means, in the detecting device, produce a change of state signal which causes impedance switching means to switch from a high to a low impedance state. This causes a current drain across the supply lines which is recognized by the CCU as the fire detection signal, which then applies the second voltage to the lines. Voltage responsive means respond to the second voltage to cause the impedance switching means to switch to the high line impedance state. The current drain is thereby reduced to conserve battery power. This avoids large current drains when several detecting devices respond to the fire (e.g. when smoke detectors are triggered by spreading smoke). The voltage responsive means may include threshold voltage means.

Abstract: Low voltage logic circuitry is used to permit an entire subsystem of an industrial controller to be placed within a hazardous environment to receive a high speed serial link and undertake the control of multiple control points without expensive and awkward long cable runs and electrically isolating circuits for each cable run. Energy and bandwidth limiting on the high speed link allows power levels commensurate with high data rates yet intrinsic safety of the media allowing it to freely pass in and out of the hazardous area. A mixture of intrinsically safe and non-intrinsically safe equipment on the same logical rack is allowed through a bus isolator providing isolated data communication in backplane fashion between modules while wholly isolating power transmission along the backplane.

Abstract: A method for producing signals indicating faulty loops in a polyphase electrical power supply network using impedance excitation, in which, after checking for ground faults, by comparing the amounts of the impedance values obtained during the impedance excitation, the signals indicating the faulty loops are formed. In order to eliminate with great certainty all the loops that are actually not faulty, in spite of initial excitation, in ascertaining loops which are exclusively free of ground faults, the actually faulty loops are determined by comparing calculated, virtual impedances, to impedances measured during the impedance excitation; in ascertaining at least one loop having ground faults, fault-free phase-to-ground loops are recognized and eliminated by comparing the amounts of the virtual impedance values, formed with respect to the phase-to-ground loops detected as faulty, to the smallest virtual impedance value, and fault-free phase-to-ground loops are recognized and eliminated.

Abstract: A child locating system including a metal bracelet. The bracelet has a circuitry compartment including a top face, a bottom face, and a periphery formed therebetween defining an interior space. The bracelet further includes a pair of metal straps with a first metal strap coupled at a first end thereof to a first side of the circuitry compartment and a second strap coupled at a first end thereof to a second side of the circuitry opposite the first side. A key actuateable locking mechanism is included for allowing the selective securement of the second end of the first strap and the second end of the second strap in a closed loop configuration about a wrist of a child. A first transceiver mechanism is situated within the interior space of the circuitry compartment and coupled to a power source. The first transceiver mechanism is adapted to deploy a recovery signal upon the receipt of an activation signal via free space.

Abstract: An in-building telephone distribution system has a multi-conductor telephone distribution cable, starting at the point where the telephone utility lines enter the building and extending from there to each location at which a telephone outlet is wanted, at which a smoke alarm is wanted, and/or at which one of numerous other devices (e.g., door chime) might be wanted. At a suitable point along the cable, a first pair of the cable's conductors is connected with the power output terminals of a Class-2 (or Class-2-equivalent) DC power supply, whose power input terminals are connected with an ordinary electric utility power line. Thus, at any point along the cable, the first pair of conductors may be accessed and used as a Class-2 DC power source. A second pair of the cable's distribution conductors is used for distribution of the telephone signals.

Abstract: An FM multiplexed broadcasting signal received by an antenna and FM-demodulated by an FM tuner portion is demodulated by a demodulation LSI into a digital signal corresponding to packet data. The digital signal is successively supplied by every packet to a CPU of a receiving portion. The CPU of the receiving portion removes unnecessary data of the received data and then supplies only data required for a CPU of a personal computer via a buffer without delay from the reception. When a transferred packet is a successive reproduction program packet or a time information packet, the CPU of the personal computer calculates latency required before a predetermined data analysis processing is started, and performs data analysis processing in an elapse of the latency. Responsively, reconfiguration of program data is performed and corresponding character information or the like is output to a displaying portion.

Abstract: A powerline communication system comprises a master and slave configuration in which the master provides both operating power and control commands to the slave over a single pair of wires. The slave, in turn, is able to communicate its status to the master with a return communications channel on the same pair of wires. Each sender impresses its signals on the power lines with an isolation transformer coupled to the gate of a power MOSFET transistor that shunts the power lines. Each receiver samples the signals from the sender with an isolation transformer that has its primary winding placed in series with the power lines. The master initiates a synchronizing pulse and places data in various timeslots. The slave follows with an initiating sync pulse followed by data in a group of timeslots. Edge-detection, rather than level-detection is used at the receivers for added immunity to supply and load changes. A double-pulse sync is used for special time slot reporting.

Abstract: A circuit monitors both digital and analog sensor readings by polling them from a single wire bus multiplex system. The circuit operates to sequentially address a plurality of smart sensor interfaces, each having an associated sensor, connected to the single wire bus. A voltage signal is supplied on the line that produces a current corresponding to the presence of a sensor at the polled interface and a current corresponding to a sensed digital or analog value where the sensor is of the digital or analog type, respectively. The currents on the bus are copied in a current mirror whose current output is applied to a resistor to produce a voltage, which in turn is converted into a digital number to be analyzed to determine the presence of a sensor at the addressed interface and its status. The current in the circuit is also measured to produce a voltage corresponding to circuit component variations and one corresponding to the contributions of the currents from the power supplies of the interfaces.

Abstract: Apparatus for controlling an electrical device by remote control including a control device coupled to the electrical device by a wire connection for providing power to the electrical device, the control device having an actuator for adjusting the status of the electrical device and a radio frequency transmitter/receiver and antenna for adjusting the status of the electrical device in response to control information in a radio frequency signal. The transmitter/receiver receives the radio frequency signal via the antenna and transmits a status radio frequency signal with information regarding the status of the electrical device. A master control unit has at least one actuator and status indicator and a transmitter/receiver for transmitting a radio frequency signal having the control information therein to control the status of the electrical device and for receiving the status information from the control device.

Abstract: A serial data communication device of an air conditioner including: an outdoor microprocessor having data transmitting/receiving terminals which transmit/receive a predetermined data; an indoor microprocessor having data transmitting/receiving terminals which transmit/receive data to/from the outdoor microprocessor; a rectification part for converting an alternating current power to a predetermined level of a direct current power to thereby supply the direct current power to the indoor/outdoor microprocessors; an outdoor interface part connected between the data transmitting terminal of the outdoor microprocessor and a direct power output terminal of the rectification part, for isolating the rectification part and the outdoor microprocessor through a first insulation switching part and simultaneously for constituting a first communication line; and an indoor interface part for isolating the rectification part and the indoor microprocessor through a second insulation switching part and simultaneously for const

Abstract: A power service unit suited for providing conditioned power to a consuming device at a remote location. The power service unit includes a charger/rectifier, a back-up power supply, together an automated dialer that contacts a central monitor in the event there is a disruption in the operation of the power service unit. The charger/rectifier accepts an external AC power and converts the external AC power to an internal DC power. The internal DC power maintains the back-up power supply in a fully charged state and the converter accepts the internal DC power and converts the internal DC power to an external DC power as required by the consuming device.

Abstract: A combined data and power transmission arrangement has one or more power supplies and loads interconnected by a power transmission line, with transmitters and receivers for transmitting a digital data signal over the transmission line. The transmitter and receiver each include an inductor for providing a high impedance barrier to a data signal on the line, so as to isolate the data signal from the power supply and load. The receiver includes circuits for tracking the mid-point value of the data signal to produce a threshold value, and for comparing the threshold value with the data signal to produce an output signal. The threshold value is a controlled positive feedback signal derived from the output of the comparator by way of a positive feedback loop having a time constant approximately equal to the time constant of the transmitter.

Abstract: A monitoring device for detecting acoustic vibrations in monitored objects has a plurality of several structure-borne sound sensors which are connected to a remote central electronic analyzing system. The individual structure-borne sound sensors are each acoustically coupled with a self-testing unit, which can be activated from the central electronic analyzing system. Activation of the self-testing units is performed by modulation of an operating voltage supplied to structure-borne sound sensors, without additional electric connections to the electronic analysis system.

Abstract: A car identification and ordering system for trains which identifies each car in the train, the order of those cars, the total number of cars in the train, and the identification of the last car in the train. The car identification and ordering system may work in conjunction with an electronic pneumatic brake system on a train or can work independently of an electronic pneumatic brake system.

Abstract: The operability of a plurality of sensors is monitored by periodically interrogating the sensors individually and evaluating the responses to the interrogation. The sensors are each connected to a two-conductor power supply bus via a signal processor and an interface. The information exchanged via the bus is in the form of binary coded signals generated by clocking the bus voltage.

Abstract: A remote electricity metering system utilizes a central station (LC) to communicate with meters (U1-U13) over the mains (10-14), with messages to remote meters being relayed by intermediate meters and the route of a message being determined by the central station. The present invention provides alarm signalling whereby the meters can communicate directly with the central station. Each meter can generate a respective combination of alarm frequencies, preferably sequentially and inside the frequency band used for normal messaging, and the local controller monitors the mains for those frequencies. An error detecting and/or correcting code can be used for the alarm frequency combinations. The central station polls the meter or meters sending the alarm. The meters are microprocessor based, with the normal message signals and the alarm frequencies being synthesized from a sequence of digital values by a D/A converter.

Abstract: A system for protection of goods against theft includes a control unit and protection modules associated with the goods, the control unit including cordless communication means and the protection modules including movement detection circuitry to find out whether the goods are being handled, and cordless communications circuitry to send an alarm message to the control unit if a movement is detected.

Abstract: An interface unit interposed between a central alarm panel and a string of smoke detectors interconnected by a three-wire bus. Two wires of the bus carry AC power and the third wire is an interunit signalling wire. When an individual detector senses a smoke condition, it places a voltage on the signalling wire. The other detectors sound their alarms upon detecting this voltage. The interface unit senses this voltage and notifies the central alarm panel, with the sensing circuitry having a variable high input impedance and being powered solely from the signalling wire. The interface unit includes a test button which, when actuated, disables communications to the central alarm panel for a predetermined period of time. During this time, the interface unit places a periodic signal on the signalling wire, which causes all of the detectors to "beep" while that signal is present. The interface unit also senses the absence of AC power on the bus for notifying the alarm panel of such AC power failure.

Abstract: A self-excited microelectromechanical device is described. The device includes a resonating structure, such as a cantilever, which responds to a physical phenomenon by generating an induced variable frequency voltage signal corresponding to the physical phenomenon. Self-excitation circuitry connected to the cantilever processes the induced variable frequency voltage signal and produces a variable frequency voltage signal in a resonant pass band of interest that is applied to the cantilever to augment the effect of the physical phenomenon on the cantilever. An exemplary use of the device is as a power line sensor. In this context, the cantilever responds to the electric field associated with a power signal on a power line. The cantilever transforms the voltage signal of the electric field into a corresponding frequency signal. The noise-immune frequency signal can be readily processed to reconstruct the power signals carried by the power line.

Abstract: Arrangement for dc signaling between a transmitter or transceiver over a single pair of conductors to another transceiver or receiver of similar design. The conductors carry a dc communications voltage at a level V.sub.comm (e.g., 24 to 35 volts dc) and power for the tranceivers, receivers and/or transmitters of the system. The transceiver comprises a microprocessor having a signal input terminal V.sub.in, a signal output terminal V.sub.out, a sensor input circuit coupled to a sensor transducer, e.g., a temperature sensor, and a control output circuit coupled to control an external device, e.g., a furnace relay. A voltage limiting circuit device coupled to the pair of conductors supplies the microprocessor with a supply voltage V.sub.dd at a predetermined level (e.g., 5 volts dc) less than the communications voltage level V.sub.comm.

Abstract: An energy monitoring and control system (10) for use with a conventional AC source (12) having a hot wire and a neutral wire (28). The energy monitoring and control system (10) includes a control station (14) and a number of controllable loads (20). The control station (14) is coupled in series with the hot wire of the AC source and is physically located between the AC source (12) and the loads (20). The individual loads are connected in parallel with each other and are coupled to the AC surce (12) and the control station (14). The control station (14) can communicate with the loads in various ways, a preferred scheme being a power-line communication method. Each of the loads is equipped with circuitry for receiving and executing commands sent by the control station (14). The control station (14) can receive information from the loads (20) by observing the AC supply current drawn by the loads (20).

Abstract: Monitor (11) includes a microcontroller (51) programmed in a first mode of operation to drive various loads (59), (69) which operate to perform tests on patient samples. The results of the tests are sensed by sensors (61), (75) and digitally stored in storage (67) for display on display (21). The microcontroller (51) is programmed in a second mode of operation to transmit the stored displayed information to a printer (13) over the line (23) transmitting power to the monitor (11) by selectively routing current through the load (69). A data transmission interface (15) includes circuitry (37) (39) (43) for sensing the changing current provided to the monitor (11) for decoding the information to be printed and for sending print information to printer (13). Error checking is performed by microprocessor (39) which inhibits all printing if any errors occur in the received message.

Abstract: A multi-functional intrusion warning system is used directly in the conventional circuitry of a building such as a home, small business or the like, having a conventional AC power source, a plurality of branch circuits and a circuit breaking means (located intermediate the power source and the branch circuits for interrupting the current to any branch circuit experiencing a current surge) to provide the building with a means of controlling the current to certain or all of the branch circuits which enables the power to be cut off to these branch circuits and then turned back on due to an occurrence detected by a motion, sound, smoke, heat, and/or telephone call activated or similar detection device. The lighting, alarms, and/or other electrical devices on these branch circuits are activated when the detection device activates the control unit of the intrusion warning system.

Abstract: A power bus digital communication system reduces power and signal cabling in a space satellite by transformer coupling digital signal sources to power bus circuits, the transformer coupling devices in all power bus circuits being in parallel relation and electrically isolated from a power supply whereby the digital communication sources may communicate among themselves at a DC power level using a square wave modulated according to a Manchester code.

Abstract: A portable alarm system is disclosed in which the alarm functions are contained within a portable enclosure, communication is maintained between the enclosure and wireless security contacts placed at points of entry, and the alarm is capable of initiating a telephone call to a security monitor station either by conventional hard wired telephone lines within a building, or by cellular transmission, or via 800 MHz trunking.

Abstract: If motion occurs in an area viewed by a lens (14) of a video camera (12), a video security monitoring system (10) establishes a communication link with a video monitoring facility and begins transmitting compressed video images of the area. The system (10) is fabricated from CMOS integrated circuits, and operates at a reduced clock frequency while motion is not detected. Reducing the clock frequency lowers the required power thus permitting operation of the system (10) on energy supplied by an ISDN basic access communication channel. If motion occurs, a digital video image compression subsystem (16) begins producing low quality compressed video data for transmission to the monitoring facility. If motion occurs in the central region of the area viewed by the lens (14), then the subsystem (16) produces a single high quality compressed video image. Commands transmitted from the monitoring facility to the video security monitoring system (10) may control its entire operation.

Abstract: A monitoring apparatus for an alarm device for situations wherein the alarm device is provided at a location remote from the alarm device drive side, which can verify from the alarm device drive side if an audible alarm has sounded. The drive of the alarm device (1) is stopped by switching off a drive switch (12) on the alarm device drive side (A). After stopping the drive of the alarm device (1) an audible alarm generation sensed signal from the response device (2) on the alarm device side (B)is received at the alarm device drive side (A) though the feeder (a). Then, after the audible alarm generation sensed signal has stopped, and on receipt of a verification signal verifying that the alarm device drive side (B) has returned to the original condition, a verification output (F3) for the audible alarm generation is generated at the alarm device drive side (A).

Abstract: A door actuating system including a keypad type remote transmitter having a keypad for transmitting door open request signals generated by pressing the keys of the keypad and a stored code type remote transmitter, including a code stored in long-term storage for transmitting door open requests including the stored code. A receiver selectively opens the door responsive to the door open requests from both types of remote transmitters. The receiver includes a user settable security switch which inhibits selective door actuation responsive to door open request signals from the stored code type transmitter while permitting selective door actuation responsive to door open request signals from keypad type transmitters.

Abstract: A transmitting box is connected to a first electrical outlet in a building. The phase of the first electrical outlet is used as the reference phase. The transmitter box senses each of the zero-cross-overs of the reference phase and injects a data packet of the data carrier frequency at each zero-cross-over. A receiving box is connected to a second electrical outlet in the building. The second electrical outlet has an unknown phase which may be different from the reference phase. The receiver box receives each data packet and senses each phase zero-cross-over of the unknown phase. The receiver box uses the time between each reception of a data packet and each detection of an unknown phase zero-cross-over to determine the phase angle of the unknown phase relative to the reference phase.

Abstract: A multi-functional intrusion warning system is used directly in the conventional circuitry of a building such as a home, small business or the like, having a conventional AC power source, a plurality of branch circuits and a circuit breaking means (located intermediate the power source and the branch circuits for interrupting the current to any branch circuit experiencing a current surge) to provide the building with a means of controlling the current to certain or all of the branch circuits which enables the power to be cut off to these branch circuits and then turned back on due to an occurrence detected by a motion, sound, smoke, heat, and/or telephone call activated or similar detection device. The lighting, alarms, and/or other electrical devices on these branch circuits are activated when the detection device activates the control unit of the intrusion warning system.

Abstract: A two-way communication system (TWACS) used with an electrical power distribution network N. The TWACS provides both outbound and inbound messages to and from remote network locations. A method of detecting and decoding unsolicited inbound messages from remote locations first involves generating the message in response to a time independent event occurring at the remote location. Formation of the message includes both generating a series of message bits, each of which has a prescribed format, and affixing a preamble to the front end of the message which comprises a plurality of bits arranged in a predetermined pattern. The message is then transmitted over any one of a plurality of communication channels n normal used for two-way communications. Since the event triggering the unsolicited inbound message is independent of time, the time of transmission is random.

Abstract: An anti-theft system that can be retrofitted onto existing aircraft disables the starter motor of an engine or engines a predetermined time after the aircraft is taken out of service and re-enables starting only after the pilot has provided adequate identification (e.g. by entering a personal identification number at a cockpit keyboard). The predetermined time interval is selected to be long enough to ensure that the system does not impose a flight hazard by preventing in-flight re-starts. In a preferred version of the system, a drop in the output voltage of the aircraft's main electric power system is used as an indication that the aircraft is out of service. To simplify installation on existing aircraft, the system provides for communication among various functional elements over a pre-existing part of the aircraft (e.g. by imposing AC tones on a starter motor control line).

Abstract: A disaster prevention monitor is disclosed in which the power consumption during a line monitoring process is reduced, and a disconnection or a short circuit of control lines can be detected by using a single switching means. A central station has a monitor command transmitter for transmitting a monitor command signal to initiate monitoring of power and control lines. A terminal or repeater station has circuitry for controlling the connection of control lines between a line monitor and power lines. During normal conditions, the control lines are not connected to the power lines, but become so connected only in response to a command from the central station. A line monitoring command causes generation of a negative voltage which is applied to line monitoring circuitry to actuate such circuitry for monitoring the status of the power and control lines.

Abstract: A power line carrier controlled lighting system connected to an AC power line.

Abstract: A control communication network system adapted for distributed control and communication between various home electrical appliances in a manner that eliminates the need for a central controller and eliminates or greatly simplifies the manual assignment of addresses, control relationships or other network resources. The system utilizes a novel and useful process of "hailing" for addresses or resources by newly introduced network devices combined with a process by which declaratory statements are used to convey identification or resource availability information to potential controlling devices. The present invention comprises an intelligent lightswitch which can be dynamically "taught" to control or to be controlled by any other similar lightswitch in a given house without special wiring or user intervention other than the toggling of a simple "teach/learn" switch associated with each lightswitch.

Abstract: A system for detecting presences has modules or devices equipped with electronic circuits for the transmission and reception of binary messages by carrier current passing through the normal domestic electric network. The devices, connected to the electric network by an incorporated plug, are in addition equipped with actuators for the control (command) of the electric power equipment in order to intercommunicate at an equivalent rank level. This system consisting of an ensemble of several devices of the above-mentioned kind associated with devices having presence-detecting characteristics is capable of carrying out the function of an anti-intrusion alarm installation.

Abstract: The present invention describes an FSK carrier communication systems for transmitting and receiving data on a electric utility line even in the presence of extreme noise. The present invention uses a unique FSK transmit and receive protocol to distinguish between noise and actual data. By careful selection of the space and mark frequencies transmitted on the power line and by using a unique variable width data-bit protocol, the receiver can distinguish between actual data and corrupted information due to noise spikes with nearly error free communication.

Abstract: The detector assembly is connectable to a power line which includes a switch which, when operated, causes power transitions at a power terminal for the detector assembly. The detector assembly includes a code responsive controller which operates in response to a plurality of power transitions occurring within a predetermined time period to deactivate a detector alarm for a determined delay period. The code responsive controller may also operate in response to different numbers of sensed power transitions to control the activation and deactivation of a light forming part of the detector assembly. A code transmitter responsive to the activation and deactivation of the detector alarm transmits an activation code and subsequently a deactivation code over the power line to activate and deactivate other detector assemblies, and a code receiver receives activation and deactivation codes from the power line and controls the activation and deactivation of the detector alarm in accordance therewith.

Abstract: A system for analyzing the operating conditions of electrical apparatus in order for the aged to check the change and abnormal state of life and for the external institute to check the safety of the houses or homes and so on. The data of standard power spectra of particular consumption current for each apparatus are stored in the memory of the system. The electrical signal detected from the wiring conductor is converted into a digital signal by the preprocessor and undergoes fast Fourier transform at the processor so as to be converted into an extracted power spectrum. If the extracted power spectrum includes a particular one of the standard power spectra as a result of comparing this spectrum with the standard power spectra, the operating conditions of that apparatus are stored in the memory with lapse of time.