Engine identification system
First Claim
1. An identification system, comprising:
- a first resistor of known magnitude;
first means for connecting said first resistor of known magnitude electrically in series with a first resistive identification circuit between an input voltage and electrical ground;
first means for measuring a first voltage magnitude at a point between said first resistor of known magnitude and said first resistive identification circuit;
a second resistor of known magnitude and a third resistor of known magnitude, said second and third resistors being connected electrically in series between said input voltage and said electrical ground;
second means for measuring a second voltage magnitude at a point between said second and third resistors; and
first means for determining the resistance magnitude of said first resistive identification circuit as a function of said first voltage magnitude and second voltage magnitude;
second means for connecting a fourth resistor of known magnitude electrically in series with a second resistive identification circuit between said input voltage and said electrical ground; and
third means for measuring a third voltage magnitude between said fourth resistor of known magnitude and said second resistive identification circuit.
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Accused Products
Abstract
An identification module and identification determination circuitry are provided for the purpose of identifying an apparatus and electrically determining the identification number of that identified apparatus. The identification module comprises a plurality of resistive identification circuits which, in turn, each comprise a plurality of resistive elements selected to have resistive magnitudes that relate to each other by powers, or orders, of two. The identification determination circuit of the present invention places each of the resistive identification circuits in series with a resistor of known magnitude between two connection points to provide a voltage potential and a resulting current flowing through the resistive identification circuit. The invention also provides a means by which the input voltage can be determined and used to adjust the determined magnitude of the resistive identification circuit.
26 Citations
23 Claims
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1. An identification system, comprising:
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a first resistor of known magnitude; first means for connecting said first resistor of known magnitude electrically in series with a first resistive identification circuit between an input voltage and electrical ground; first means for measuring a first voltage magnitude at a point between said first resistor of known magnitude and said first resistive identification circuit; a second resistor of known magnitude and a third resistor of known magnitude, said second and third resistors being connected electrically in series between said input voltage and said electrical ground; second means for measuring a second voltage magnitude at a point between said second and third resistors; and first means for determining the resistance magnitude of said first resistive identification circuit as a function of said first voltage magnitude and second voltage magnitude; second means for connecting a fourth resistor of known magnitude electrically in series with a second resistive identification circuit between said input voltage and said electrical ground; and third means for measuring a third voltage magnitude between said fourth resistor of known magnitude and said second resistive identification circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for reading a resistively coded identification value, comprising:
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means for connecting a first resistive identification circuit electrically between a first connection point and a second connection point; means for disposing a first resistor of known magnitude electrically in series with said first resistive identification circuit between said first connection point and said second connection point; means for providing a voltage potential between said first and said second connection points; first means for measuring a first voltage at a point between said first resistor of known magnitude and said first resistive identification circuit; means for connecting a second resistive identification circuit electrically between said first and second connection points; means for disposing a second resistor of known magnitude electrically in series with said second resistive identification circuit between said first connection point and said second connection point; and third means for measuring a second voltage at a point between said second resistor of known magnitude and said second resistive identification circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for reading a resistively coded identification value, comprising:
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connecting a first resistive identification circuit electrically between a first connection point and a second connection point; disposing a first resistor of known magnitude electrically in series with said first resistive identification circuit between said first connection point and said second connection point; providing a voltage potential between said first and said second connection points; determining the resistance of said first resistive identification circuit as a function of first voltage; disposing a serially connected pair of resistors of known magnitude electrically between said first and second connection points; measuring a reference voltage at a point between said pair of resistors; determining the resistance of said first resistive identification circuit as a function of first and said reference voltages; connecting a second resistive identification circuit electrically between said first and second connection points; disposing a second resistor of known magnitude electrically in series with said second resistive identification circuit between said first connection point and said second connection point; and measuring a second voltage at a point between said second resistor of known magnitude and said second resistive identification circuit. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification