start bit[′stärt ‚bit]
The first bit transmitted in asynchronous data transmission to unequivocally indicate the start of the word.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
start bitIn asynchronous communications, the bit transmitted before each character.
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