Single wire transmission of multiple switch operations

Details Single wire transmission of multiple switch operations Single wire transmission of multiple switch operations

1977-05-31

1978-10-03

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340537, 340545, 307100, 307116, G08B 2500

Patent

active

041187008

ABSTRACT:
Each of a plurality of switches is connected in parallel with an impedance and the switches are coupled to form a series circuit. A reference voltage is coupled to one end of the series circuit and a termination impedance is coupled to the other end to form a voltage divider. The voltage divider ratio is determined by the switches that are operated and the divided voltage is coupled to an analog-to-digital converter producing a binary output signal that indicates which combination of switches is operated. Another embodiment of the invention uses a constant current generator instead of a termination impedance to provide linear ratios in the voltage divider.

REFERENCES:
patent: 3370181 (1968-02-01), Sitomer

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