METHOD AND SYSTEM FOR MODULATING A CARRIER FREQUENCY TO SUPPORT NONDESTRUCTIVE BITWISE ARBITRATION OF A COMMUNICATION MEDIUM
First Claim
1. A system for modulating a carrier frequency to support nondestructive bitwise arbitration of a communication medium, comprising:
- a first sensor module coupled to a power supply line via a first power line coupling circuit, wherein said first sensor module comprises;
a first micro-controller; and
a first transceiver including a first transmitter for converting a digital signal received from said first micro-controller into a first analog signal for transmission on said power supply line, said first transmitter including a first oscillator operating within an allowable frequency deviation to provide a first predetermined onset phase; and
a second sensor module coupled to said power supply line via a second power line couple circuit, wherein said second sensor module comprises;
a second micro-controller; and
a second transceiver including a second transmitter for converting a digital signal received from said second micro-controller into a second analog signal for transmission on said power supply line, said second transmitter including a second oscillator operating within said allowable frequency deviation to provide a second predetermined onset phase, second analog signal is different from said first analog signal and said second predetermined onset phase is different from said first predetermined onset phase, the difference between said first predetermined onset phase and said second predetermined onset phase being within a limit.
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Abstract
A system for modulating a carrier frequency to support nondestructive bitwise arbitration of a communication medium. The system comprises a first sensor module coupled to a power supply line via a first power line coupling circuit. The first sensor module comprises a first micro-controller and a first transceiver. The first transceiver includes a first transmitter for converting a digital signal received from the first micro-controller into a first analog signal for transmission over the power supply line. The first transmitter includes a first oscillator operating within an allowable frequency deviation to provide a first predetermined onset phase. The system further comprises a second sensor module coupled to the power supply line via a second power line coupling circuit. The second sensor module comprises a second micro-controller and a second transceiver. The second transceiver includes a second transmitter for converting a digital signal received from the second micro-controller into a second analog signal for transmission over the power supply line. The second transmitter includes a second oscillator operating within the allowable frequency deviation to provide a second predetermined onset phase. The second analog signal is different from the first analog signal and the second predetermined onset phase is different from the first predetermined onset phase. The difference between the first predetermined onset phase and the second predetermined onset phase is within a limit.
30 Citations
24 Claims
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1. A system for modulating a carrier frequency to support nondestructive bitwise arbitration of a communication medium, comprising:
a first sensor module coupled to a power supply line via a first power line coupling circuit, wherein said first sensor module comprises;
a first micro-controller; and
a first transceiver including a first transmitter for converting a digital signal received from said first micro-controller into a first analog signal for transmission on said power supply line, said first transmitter including a first oscillator operating within an allowable frequency deviation to provide a first predetermined onset phase; and
a second sensor module coupled to said power supply line via a second power line couple circuit, wherein said second sensor module comprises;
a second micro-controller; and
a second transceiver including a second transmitter for converting a digital signal received from said second micro-controller into a second analog signal for transmission on said power supply line, said second transmitter including a second oscillator operating within said allowable frequency deviation to provide a second predetermined onset phase, second analog signal is different from said first analog signal and said second predetermined onset phase is different from said first predetermined onset phase, the difference between said first predetermined onset phase and said second predetermined onset phase being within a limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for modulating a carrier frequency to support nondestructive bitwise arbitration of a communication medium, comprising:
a sensor module locally coupled to a warning system for sensing operational performance of the warning system and to a power supply line, said sensor module comprising;
a sensor element for transducing physical phenomena into electrical signals;
a micro-controller that exchanges-data according to the controller area network (CAN) standard coupled to said sensor element;
a transceiver coupled to said micro-controller, said transceiver responsive to CAN bus states issued by said micro-controller for communicating data between said power supply line and said micro-controller, said transceiver including;
a transmitter for converting a digital signal from said micro-controller into an analog signal for transmission on said power supply line, said transmitter including an oscillator operating within an allowable frequency deviation to provide a predetermined onset phase, wherein said transmitter utilizes on/off shift keying for modulation; and
a receiver for converting said analog signal from said power supply line into a digital signal for input to said micro-controller, said receiver including an in-band energy detector; and
a sensor hub coupled to said power supply line for receiving data from said sensor module via said power supply line. - View Dependent Claims (17, 18, 19)
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20. A method for modulating a carrier frequency to support nondestructive bitwise arbitration of a communication medium, comprising:
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receiving a request to initiate data transfer including a first controller area network (CAN) formatted message frame with a first identifier, wherein said request is received from a first micro-controller located at one of a plurality of nodes coupled to a power supply line;
detecting an idle CAN bus on said power supply line;
sending said first CAN formatted message frame across said power supply line using a first transceiver operating according to the CAN protocol, wherein said first transceiver includes a first transmitter that includes a first oscillator operating within an allowable frequency deviation and said sending said first CAN formatted message frame includes turning on said first oscillator in a first predetermined onset phase in response to detecting a dominant bit in said first identifier to implement said CAN protocol over said power supply line; and
sending a second CAN formatted message frame including a second identifier across said power supply line using a second transceiver operating under the CAN protocol, wherein said second transceiver includes a second transmitter that includes a second oscillator operating within said allowable frequency deviation and said sending said second message frame includes turning on said second oscillator in a second predetermined onset phase in response to detecting a dominant bit in said second identifier to implement said CAN protocol over said communication medium, wherein said second predetermined onset phase is different than said first predetermined onset phase, the difference between said first predetermined onset phase and said second predetermined onset phase being within a limit. - View Dependent Claims (21, 22, 23, 24)
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Specification