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start bit

   Also found in: Wikipedia, Hutchinson 0.03 sec.

In asynchronous communications, the bit transmitted before each character.

(protocol)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.
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In one embodiment of the present invention, preamble and synchronization word patterns are selected such that the start bit of the first byte of data that follows the synchronization word synchronizes with the start bit clocking signal of the baseband receiving serial port.
Airbee Files Patent Application for New Wireless Data Transmission ... by Business Wire
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