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In common RS-232 there are pairs of control lines which are usually referred to as ''hardware flow control'':
* RTS (request to send) and CTS (clear to send), used in [[RS-232 RTS/CTS|RTS flow control]]
* DTR ([[Data Terminal Ready|data terminal ready]]) and DSR ([[Data Set Ready|data set ready]]), used in DTR flow control
Hardware flow control is typically handled by the DTE or "master end", as it is first raising or asserting its line to command the other side:
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