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.

[Is this upside-down?]

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StarLISP StarMOD star network Starset STARSYS	asynchronous bit stuffing EIA-423 modem start bit	Start Of Header Start Of Text start tag state state diagram