start bit

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start bit

[′stärt ‚bit]
(computer science)
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.

start bit

(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.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

start bit

In asynchronous communications, the bit transmitted before each character.
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References in periodicals archive ?
ABSTRACT: This paper gives a brief introduction to an implementation of an embedded device for converting data from an asynchronous serial communication port to TCP/IP or UDP packets and vice versa using an ARM-based 32-bit microcontroller.
Peng, "A design of multiprotocol asynchronous serial communication based on M module," in Proceedings of the 1st International Conference on Instrumentation and Measurement, Computer, Communication and Control (IMCCC '11), pp.
The LPCI eight-port cards are asynchronous serial communication cards designed for use on the PCI and PCI-X bus.
All the chips have asynchronous serial communications (up to 11.5 kbaud) and eight analog ports (0 to 5 VDC input, 10 bit).

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