part_5a_X10 - X10 PLC R. Newman University of Florida What...

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X10 PLC R. Newman University of Florida
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What is X10 Narrowband PLC for home automation (domotics) International and open industry standard 13 manufacturers (including GE, Panasonic) Developed in 1975 by Pico Electronics (Scotland) First products shipped in 1978 First general domotics technology, most widely available Modules addressed with house and unit codes Comprises PHY – modulation, coupling, etc. DL – frame format AL – command language
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X10 PHY Transmissions immediately after zero crossings (within 200 usec) Less noise at zero crossings Line cycle provides synchronization 120 KHz carrier – sent as burst (1 msec) Repeated at 1/3 and 2/3 half line cycle for 3- phase systems (to be at zero crossing for all) One bit per zero crossing Data bits repeated in inverted form in next half line cycle (like biphase encoding)
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X10 PHY 1 msec burst repeated 3 times in half line cycle
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X10 symbol coding ASK modulated biphase encoding
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part_5a_X10 - X10 PLC R. Newman University of Florida What...

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