Asynchronous serial communication describes an
asynchronous transmission protocol in which a start signal is sent prior to each byte, character or code word and a stop signal is sent after each code word. The start signal serves to prepare the receiving mechanism for the reception and registration of a symbol and the
stop signal serves to bring the receiving mechanism to rest in preparation for the reception of the next symbol. A common kind of start-stop transmission is
ASCII over
RS-232, for example for use in
teletypewriter operation.
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In serial communications, where each bit of the message is transmitted in sequence, stop bits are extra "1" bits which follow the data and any
parity bit. They mark the end of a unit of transmission (normally a byte or character).
For example, characters on an
EIA-232 serial line may have one or two stop bits added. Some
UARTs even allow for 1.5 stop bits but one is probably the most commonly used. A serial connection may be described as, for example, "8N1" which means eight data bits, no
parity and one stop bit.
(1995-01-24)
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