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start stop mode

Start-stop operation is an asynchronous transmission in which a start bit preceding the character group defines a new time frame in each case.

Bit frame in start-stop operation

Bit frame in start-stop operation

The start
bit

bit

is followed by the character group with the information bits. Usually there are eight information bits, which together form one byte.

The receiving device uses the start bit to select the information bits and to generate the clock signal. The start-stop operation is terminated with the stop bit, which follows the parity bits. After the stop bit has been detected, the receiving device is set to the idle state and can be prepared again for the reception of the coming information bits with the following start bit.

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Englisch: start stop mode
Updated at: 25.05.2011
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