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| Number | Title | Issue Date |
| 4689619 | Method and apparatus for polling subscriber terminals Subscriber terminals serviced by a plurality of remotely located two-way addressable cable television systems are polled using polling command signals addressed to the different terminals from a polling center. The polling command signals are sent to the ... | 08/25/1987 |
| 4683531 | Polling method for data processing system A method for polling a plurality of remote processing units includes establishing a table of active and inactive remote processing units, sequentially polling each of the active processing units, at the conclusion of polling the active processing units, p... | 07/28/1987 |
| 4667193 | Addressing system for simultaneously polling plural remote stations In a contention polling arrangement wherein polling messages are transmitted by a central controller for simultaneously polling a group of remote stations, the polling message contains an address which defines the entire range of remote stations to be pol... | 05/19/1987 |
| 4658249 | Data communication system with key data bit denoting significance of other data bits A communications system includes a transmitter for sending successive composite signals, each of which has successive segments which represent different data. A composite signal can be a pulse group with the segments denoted by individual pulses. A plural... | 04/14/1987 |
| 4658243 | Surveillance control apparatus for security system In a polling type surveillance control apparatus for a security system, inherent addresses are assigned to respective terminal devices such as smoke detectors, temperature sensors, gas leakage detectors, fire partitions and smoke dampers. When a self addr... | 04/14/1987 |
| 4628309 | System and device for remote surveillance of equipment on a digital transmission link without interrupting traffic A remote surveillance utilizing signalling incorporated in traffic and concerns more particularly digital links using a prohibited configuration code for the line signal. The purpose is to produce a system consisting of periodically incorporating an inter... | 12/09/1986 |
| 4604618 | Time-division multiplex transmission system In a time-division multiplex transmission system, a host machine (3) and a plurality of addressable terminals (51 to 56) are connected together by way of a signal line (6). The same address (A) is assigned to a group of the terminals (51 to 54) so that th... | 08/05/1986 |
| 4598286 | Method and apparatus for controlling distributed electrical loads An apparatus for controlling distributed electrical loads including a microprocessor based central controller coupled via a twisted pair bidirectional data line to a plurality of microcomputer based transceiver decoders. Each transceiver decoder is couple... | 07/01/1986 |
| 4595921 | Method of polling to ascertain service needs In a communication facility a masterstation initially directs a single inquiry signal to the aggregate of the operating stations and receives a response from this aggregate indicating by its structure which of the several individual stations currently nee... | 06/17/1986 |
| 4574283 | Data transmission system for use in an air conditioning control apparatus In a data transmission system having a main controller for transmitting polling messages in a polling sequence and a plurality of terminal controllers responsive to a polling message to transmit data to the main controller, the finally polled terminal con... | 03/04/1986 |
| 4536748 | Process for protecting a remote monitoring system against sabotage and a system using this process Each sensor of the system is connected to a central station and is interrogated cyclically. In turn, the sensors generate over a bus line a variable amplitude signal synthesized from data stored in a read only memory. Each sensor has a read only memory wi... | 08/20/1985 |
| 4535332 | Method and apparatus for controlling distributed electrical loads An apparatus for controlling distributed electrical loads including a microprocessor based central controller coupled via a twisted pair bidirectional data line to a plurality of microcomputer based transceiver decoders. Each transceiver decoder is couple... | 08/13/1985 |
| 4527235 | Subscriber terminal polling unit A subscriber services system polling unit in which microprocessors, each primarily responsible for controlling the polling of half the subscriber terminals, may be switched to also control the polling of the other half of the subscriber terminals.... | 07/02/1985 |
| 4512033 | Remote level adjustment system for use in a multi-terminal communications system A remote level adjustment system for use in a multi-terminal communications system wherein a plurality of remote terminals are connected to a master terminal by a distribution network for bi-directional transmission of signals. The remote terminals are ad... | 04/16/1985 |
| 4494111 | Frequency agile security apparatus A cable TV security system utilizes three radio frequency signals as three data communication channels: one downstream channel and two upstream channels. A headend alarm processor transmits system commands on the downstream channel. A plurality of subscri... | 01/15/1985 |
| 4477809 | Method for random-access radio-frequency data communications A method for random-access data communications to and from a central controller, from and to at least one of a plurality of remote stations, by providing at least one radio-frequency channel having the bandwidth thereof allocated into at least a message c... | 10/16/1984 |
| 4466001 | Polling system for multiple terminal units A semi-duplex communication system provides high channel efficiency by having the base station transmit a reference signal which each terminal uses as a sync signal. Each unit having data to send to the base responds with a very brief signal such as a bur... | 08/14/1984 |
| 4451826 | Single transmission line data acquisition system A single transmission line interrogated multiple channel data acquisition system is provided in which a plurality of remote station/sensors monitor specific process variables and transmit measurement values over the single transmission line to a master st... | 05/29/1984 |
| 4446462 | Method and apparatus for multiple frequency transmission of information in a digital communication system A meter terminal unit, for acquiring information and transmitting the acquired information to a central reading and control unit over utility power transmission lines, includes a transmitter portion for synthesizing and modulating carrier waveforms, the f... | 05/01/1984 |
| 4421144 | Filling stop identification for looms Apparatus and method for uniquely identifying which of a plurality of filling yarns used by a loom in a weaving process has broken and caused an automatic stop of the loom. The apparatus is particularly suited for fabrication by modifying known and common... | 12/20/1983 |
| 4419666 | System for controlling power distribution to customer loads A method and apparatus which permits a power utility to have direct control of customers loads (CD) with a view toward facilitating enablement of a load management philosophy which includes peak shaving and load deferral. A master control station (MCS), w... | 12/06/1983 |
| 4408345 | Remote line monitoring method and device for CATV system A remote line monitoring device and method for a CATV system in which a center facility is connected to plural terminal units through cables of the system to transmit television signals to subscribers' homes. A plurality of monitoring terminal units are p... | 10/04/1983 |
| 4342986 | Central station alarm reporting system A central station alarm reporting system having a remote premises unit which is polled by the central station using FSK messages and reports its alarm information in DTMF (dual tone multifrequency) messages wherein a plurality of parallel bits of informat... | 08/03/1982 |
| 4283709 | Cash accounting and surveillance system for games A cash accounting and surveillance system for games, whereby operation of a number of player operated gaming devices may be monitored for purposes of detecting abnormal operation and/or cheating and for providing automatic accounting information for recor... | 08/11/1981 |
| 4281315 | Collection of messages from data terminals using different protocols and formats A central controller (104) for a multipoint polling system arranged to collect inquiry messages from data terminals (102a-n, 103a-n) for processing by a data base (101) and for distributing response messages to the terminals, the several terminals using d... | 07/28/1981 |
| 4263580 | Monitor system for operation of solenoid operated devices Command words with address signals are transmitted periodically from a control room to field solenoid valves which are each provided with a single actuation circuit. The solenoid valves that are to be actuated in the field each correspond to the address o... | 04/21/1981 |
| 4167730 | Compression of data on status of remote equipment In communication system comprising plurality of earth stations tied together by relay (e.g. satellite-borne) in which status of individual subscriber line interface units must be continually reported to central control unit, only status changed since prev... | 09/11/1979 |
| 4162483 | Bilateral master station-plural satellite station signalling apparatus A bilateral digital signalling network couples a master station and plural remote, or satellite stations via a common communications link--as by way of an MATV coaxial cable. Any data/control signals may be interchanged by the system stations--for example... | 07/24/1979 |
| 4161635 | Address verification system An address verification system is described for use in a communications system comprising a transmission path (14) having sequence of remote stations (1, 2, ... n) distributed therealong. After accessing the desired station, a loop-back (32) is establishe... | 07/17/1979 |
| 4160238 | Remote control addressing and reply indicating system A plurality of receivers which can be respectively addressed by addressing pulses provide reply pulses on a separate reply signal bus indicative of a single digit, or multi-digit binary response condition. To permit extended indication, the central statio... | 07/03/1979 |
| 4138669 | Remote monitoring and controlling system for subsea oil/gas production equipment A remote monitoring and controlling system for sub-sea oil/gas production equipment includes a control station for generating an appropriate digital code signal to accomplish a desired function and a cooperating remote station station system for receiving... | 02/06/1979 |
| 4135181 | Automatic remote meter reading and control system An automatic meter reading and control system for communicating with remote terminal points includes a central station which selectively communicates with a transponder controller unit at each terminal point via a plurality of distribution units, each ser... | 01/16/1979 |
| 4047159 | Data transmission systems A data transmission system for interfacing a computer with a plurality of data sources which are in groups, each group at an individual remote location, comprising local interface apparatus for the computer and remote interface apparatus for each remote l... | 09/06/1977 |
| 4035772 | Utility meter reading system A number of remote terminals are connected to various utility meters to store the readings therein. A central terminal sequentially transmits signals to the remote terminals to actuate the same to transmit the meter readings to the central terminal. Each ... | 07/12/1977 |
| 4020359 | Electrical control system An electrical control system for controlling a plurality of electrical loads comprises an electrical drive unit capable of providing a plurality of separate electrical signals each at a different reference level and a fixed frequency coded electrical inte... | 04/26/1977 |
