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The subject matter of this specification can be embodied in, among other things, an identification system includes a first component having a first resistor and a second resistor, a second component having a sensor configured to sense a voltage difference between a first bus and a second bus and a s

The subject matter of this specification can be embodied in, among other things, an identification system includes a first component having a first resistor and a second resistor, a second component having a sensor configured to sense a voltage difference between a first bus and a second bus and a selector signal output port configured to provide a first selector signal and a second selector signal, and a third component having a switching network configured to electrically connect the second bus to the first bus across one or both of the first resistor and the second resistor in response to the first selector signal, and electrically connect the second bus to the first bus across a different one of the first resistor or the second resistor in response to the second selector signal.

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1. An identification system comprising: a first component comprising: a first resistor; anda second resistor;a second component comprising: a sensor configured to sense a voltage difference between a first bus and a second bus; anda selector signal output port configured to provide a first selector

1. An identification system comprising: a first component comprising: a first resistor; anda second resistor;a second component comprising: a sensor configured to sense a voltage difference between a first bus and a second bus; anda selector signal output port configured to provide a first selector signal and a second selector signal; anda third component comprising: a switching network configured to electrically connect the second bus to the first bus across one of the first resistor and the second resistor in response to the first selector signal, and electrically connect the second bus to the first bus across a different one of the first resistor or the second resistor in response to the second selector signal. 2. The identification system of claim 1, wherein: the first component further comprises a first port in direct electrical communication with the first resistor and not in direct electrical communication with the second resistor; a second port in direct electrical communication with the second resistor and not in direct electrical communication with the first resistor, and a third port in direct parallel electrical communication with the first resistor and the second resistor, and the first bus is in electrical communication with the third port; andthe switching network is further configured to electrically connect the second bus to the first port in response to the first selector signal, and electrically connect the second bus to the second port in response to the second selector signal. 3. The identification system of claim 1, wherein: the first component further comprises a first port and a second port in electrical communication with the first port across the first resistor in series electrical connection with the second resistor; andthe switching network is further configured to electrically bypass electrical communication between the first port and the second port around one of the first resistor or the second resistor in response to the first selector signal, and not bypass electrical communication around the first resistor or the second resistor in response to the second selector signal. 4. The identification system of claim 1, wherein: the first component further comprises a first port and a second port in electrical communication with the first port across a first electrical path in parallel with a second electrical path, the first electrical path comprising the first resistor in series electrical connection with a first switch of the switching network, and the second electrical path comprising the second resistor in series electrical connection with a second switch of the switching network; andthe switching network is further configured to close the first switch and open the second switch in response to the first selector signal, and open the first switch and close the second switch in response to the second selector signal. 5. The identification system of claim 1, wherein the second component further comprises a current source configured to provide a current between the first bus and the second bus. 6. The identification system of claim 1, wherein at least one of the first resistor and the second resistor is a programmable resistor programmed to provide a selected resistance. 7. The identification system of claim 1, wherein the third component is located remotely from the first component. 8. The identification system of claim 1, wherein the second component comprises the third component. 9. The identification system of claim 1, wherein the first component is selected from a group comprising a fuel metering unit, an actuator, a valve, and a line replaceable unit, and the second component is an engine controller. 10. The identification system of claim 1, wherein the first component further comprises a line replaceable unit configured to receive a driver signal, the selector signal output port configured to provide the driver signal as at least one of the first selector signal and the second selector signal. 11. The identification system of claim 1, wherein the selector signal output port is further configured to provide a third selector signal, and the switching network is configured to electrically connect the second bus to the first bus across one of the first resistor and the second resistor in response to the first selector signal, electrically connect the second bus to the first bus across a different one of the first resistor or the second resistor in response to the second selector signal, and electrically connect the second bus to the first bus across both the first resistor and the second resistor in response to a third selector signal. 12. A method of identifying a component, the method comprising: providing a first bus and a second bus;providing a first selector signal at a selector port;connecting, based on the first selector signal, a first resistor between the first bus and the second bus;measuring a first resistance between the first bus and the second bus to determine a first resistance value;providing a second selector signal at the selector port;connecting, based on the second selector signal, a second resistor between the first bus and the second bus; andmeasuring a second resistance between the first bus and the second bus to determine a second resistance value. 13. The method of claim 12, further comprising determining an identity based on the first resistance value and the second resistance value. 14. The method of claim 13, further comprising: providing a collection of known resistance values and corresponding identity values;comparing the first resistance to the collection of known resistance values to identify a first corresponding identity value; andcomparing the second resistance to the collection of known resistance values to identify a second corresponding identity value;wherein the identity is based on the first corresponding identity value and the second corresponding identity value. 15. The method of claim 13, further comprising: identifying a first coefficient value based on the first resistance value; andidentifying a second coefficient value based on the second resistance value;wherein the identity is based on an output value provided by a mathematical formula comprising the first coefficient value and the second coefficient value. 16. The method of claim 12, wherein a first component provides the first resistor and the second resistor, a second component provides the selector signal to the first component and measures the first resistance and the second resistance, and the second component determines an identity of the first component based on the first resistance value and the second resistance value. 17. The method of claim 16, wherein the second component is located remotely from the first component. 18. The method of claim 12, wherein at least one of the first resistor and the second resistor is a programmable resistor, and the method further comprises programming the programmable resistor to provide a selected one of the first resistance and the second resistance. 19. The method of claim 12, further comprising: providing a third selector signal at the selector port;connecting, based on the third selector signal, both the first resistor and the second resistor between the first bus and the second bus; andmeasuring a third resistance between the first bus and the second bus to determine a third resistance value. 20. The method of claim 12, further comprising: providing at least one of the first selector signal and the second selector signal as a driver signal to a line replaceable unit; anddriving operation of the line replaceable unit based on the driver signal.