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Asynchronous serial communication
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<p>Asynchronous serial communication is a form of <a href="/facts/Serial_communication/r5xP7P1c">serial communication</a> in which the communicating endpoints' interfaces are not continuously synchronized by a common clock signal. Synchronization (<a href="/facts/Clock_recovery/hrTr6rlS">clock recovery</a>) is done by data-embedded signal: the data stream contains synchronization information in a form of start and stop signals set before and after each payload transmission. The start signal prepares the receiver for arrival of data and the <a href="/facts/Stop_signal/d35jfDJP">stop signal</a> resets its state to enable triggering of a new sequence. </p><p>A common kind of start-stop transmission is <a href="/facts/ASCII/vGUI33Qu">ASCII</a> over <a href="/facts/RS-232/NCpvGuyq">RS-232</a>, for example for use in <a href="/facts/Teletypewriter/pn5SQKTf">teletypewriter</a> operation. </p>