Communications: electrical – Continuously variable indicating – With meter reading
Patent
1980-06-18
1982-07-06
Pitts, Harold I.
Communications: electrical
Continuously variable indicating
With meter reading
34087003, 34082531, 34082534, 34082535, G08C 1928
Patent
active
043386016
ABSTRACT:
A monitoring apparatus which has a plurality of encoders for installation at respective outlying stations, a decoder for installation at a central station and a portable memory module to be carried by a person whose visits to the outlying stations are to be monitored. Each encoder includes a particular configuration of permanent magnets which provides it with its own predetermined magnetic code for identifying the station at which it is installed. This code, in the case of each encoder, is read out and converted to a corresponding binary electric pulse code with the aid of reed switches in the portable memory module, the switches being operated by the fields of respective ones of the encoder magnets when the module is interfaced with the encoder, the electric pulses being inputted to a shift register which is also in the module and which electronically stores the pulse code. After the last of the outlying stations has been visited and the pulse codes thereof have been serially stored in the shift register, the codes are transferred by electromagnetic induction to a binary-to-decimal converter in the decoder upon interfacing the memory module with the decoder, the transfer being initiated by the operation of an additional reed switch in the module by a permanent magnet in the decoder. A visual display device, also in the decoder, is actuated by the output of the converter to indicate whether or not the visits being monitored were in fact made.
REFERENCES:
patent: 3840866 (1974-10-01), St. Clair
patent: 4119948 (1978-10-01), Ward
patent: 4132981 (1979-01-01), White
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