Transmission of data via power lines
AssigneeABB Power T&D Company Inc.
InventorsLeonard C. Vercellotti, Dirk J. Boomgaard
Life of this patent
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Abstract
A method for transmitting data in the form of a sequence of data words according to PLBus communications protocol in a channel (20) carrying data transmitted, according to a different protocol, in the form of timed bursts of a signal, comprising: producing (16) a carrier which is continuous at least for the duration of each data word; angularly modulating (14, 16) the carrier in accordance with the information contained in each data word; and transmitting the angularly modulated carrier in the channel (20).
Claims6
A method for transmitting data via a power line which also carries a mains voltage which varies in amplitude to have a succession of zero crossings which occur at the frequency of the mains voltage, the data being contained in a sequence of binary data words each containing information, and the data being transmitted over the power line according to a first communications protocol which provides a signal varying between two signal states during successive intervals, with the duration of each interval defining the value of a respective data word bit, the power line also being connected to carry data according to a different protocol in which bursts of a signal are synchronized to zero crossings of the mains voltage, said method comprising:
- producing a carrier which is continuous at least for the duration of each data word;
- angularly modulating the carrier in accordance with the information contained in each data word;
- and transmitting the continuous angularly modulated carrier over the power line.
Dependencies are inferred from the claim text.