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1 definition found
 for start bit
From The Free On-line Dictionary of Computing (18 March 2015) :

  start bit
      A bit which signals the start of transmission of
     a character on a serial line.  For an RS-423 signal, the
     line is normally at logical zero which there is no data and
     the start bit is a logical one.  The zero-one transition tells
     the receiver when to start sampling the signal to extract the
     data bits.
     [Is this upside-down?]

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