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.

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.

start bit

In asynchronous communications, the bit transmitted before each character.
References in periodicals archive ?
Note that the framing bit position sequence repeats after 24 frames (extended superframe) instead of 12 (superframe) even though there are only six bits in the framing pattern instead of twelve.
Because there are only six framing bits per 24 framing bit positions in the ESF format, the framing bit occurs at a 2-kb/s rate even though the framing bit position occurs 8,000 times per second.
Naturally, there are occasions when the framing pattern sequence occurs in a bit position other than in the framing bit position.
This presents no problem provided the detector realizes that it hasn't found frame (for example, when two out of the next four bits in the assumed framing bit position aren't in the expected sequence).