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start bit

start bit in Technology

protocol
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?]
(1995-02-02)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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