Remote reading thermostat
First Claim
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1. An information transmission system for acquiring information and transmitting same from an operating station to a collection station using electrical power supplied from said collection station, said system comprising:
- a current transmitting detector means capable of applying voltages across a pair of transmission interconnections each electrically connected at one end thereof to said current transmitting detector means, and further capable of providing a resulting line current therethrough to that extent permitted by that value of electrical impedance effectively occurring across said pair of transmission interconnections at an opposite end thereof, said current transmitting detection means having therein a current detection means capable of determining whether said line current has a value greater or less than a selected value based on differences in values therebetween;
a data gathering means for acquiring information desired to be transmitted, said data gathering means having an output on which is provided an output signal containing a representation of such information as has been acquired; and
a current modulator means for electrical connection to said opposite end of said pair of transmission interconnections, said current modulation means being electrically connected to said output of said data gathering means, said current modulator means having a selectively adjustable value electrical impedance therein for electrical connection between said pair of transmission interconnections, said current modulator means being capable of changing values of effective electrical impedance of said adjustable value electrical impedance to values above or below a selected impedance value, capable of yielding said selected value of line current, in response to said data gathering means output signal.
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Abstract
An information transmission system using a pair of transmission interconnections to supply power from a collection station to an operating station, and to transmit information back based on the collection station providing a changing voltage on the two interconnections and the operating station modulating the amount of current drawn about a reference current to represent information.
23 Citations
11 Claims
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1. An information transmission system for acquiring information and transmitting same from an operating station to a collection station using electrical power supplied from said collection station, said system comprising:
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a current transmitting detector means capable of applying voltages across a pair of transmission interconnections each electrically connected at one end thereof to said current transmitting detector means, and further capable of providing a resulting line current therethrough to that extent permitted by that value of electrical impedance effectively occurring across said pair of transmission interconnections at an opposite end thereof, said current transmitting detection means having therein a current detection means capable of determining whether said line current has a value greater or less than a selected value based on differences in values therebetween; a data gathering means for acquiring information desired to be transmitted, said data gathering means having an output on which is provided an output signal containing a representation of such information as has been acquired; and a current modulator means for electrical connection to said opposite end of said pair of transmission interconnections, said current modulation means being electrically connected to said output of said data gathering means, said current modulator means having a selectively adjustable value electrical impedance therein for electrical connection between said pair of transmission interconnections, said current modulator means being capable of changing values of effective electrical impedance of said adjustable value electrical impedance to values above or below a selected impedance value, capable of yielding said selected value of line current, in response to said data gathering means output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for transmitting information acquired at an operating station over a pair of transmission interconnectors to a collection station, said method comprising:
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applying a voltage changing between values during change portions thereof across said pair of transmission interconnections at said collection station; changing electrical impedance provided across said transmission interconnections in said operating station to cause current flowing in said transmission interconnections to alternate between a selected current value during a part of said change portions and values above or below said selected current value during another part of said change portions in accord with a representation of that information desired to be transmitted; and detecting said selected value and said values above and below said selected value of current flowing in said pair of transmission interconnections at said collection station during said change portions.
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Specification