Communications: electrical – Digital comparator systems
Patent
1977-01-14
1978-09-12
Yusko, Donald J.
Communications: electrical
Digital comparator systems
340147SY, 340168B, 340310A, 325 58, H04M 1104
Patent
active
041141415
ABSTRACT:
A communication system is disclosed for transmitting digital information between a central station and a large number of remote stations. Digital information is identified by the relationship between a simple pulse marking signal and a time reference signal which is common to all stations, that is, the time reference signal synchronizes the operation of all the stations. The relationship of the marking signal, which does not in itself carry any digital information, to the time reference signal is initially determined by the content of the digital information. Thus, this digital information can only be subsequently determined by evaluating the relationship between the marking signal and the time reference signal. In this communication system, digital radio wave transmission is used to transmit marking signals between stations and the power lines of a power distribution system are used as the source of the time reference signal. The marking signals transmitted by radio waves are used to start and stop digital counters located at each of the stations in the communication system. The operation of these digital counters is synchronized by the time reference signal transmitted over the power lines of the power distribution system. Since the relationship between the radio wave marking signals and the power line reference signal is identified by these digital counters, the digital information is transferred from one station to another and vice versa simply by the controlled operation of these digital counters.This communication system is primarily intended for use in a power distribution system for transmitting digital information from a plurality of remote stations each having a watt-hour meter associated therewith to a central station which uses this digital information for load management and control. The central station is capable of requesting a particular one of the plurality of remote stations to transmit digital information by actuating the digital counters in the manner described above. In response to the request from the central station, the particular remote station responds by transmitting the digital information contained therein to the central station which identifies the responding remote station.
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C. Clifford, "Six Decade Counter For Industrial Systems", New Electronics, vol. 8, No. 13, pp. 27, 30, Jun. 24, 1975.
Datrix Corporation
Yusko Donald J.
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