<![CDATA[Is it forbidden to change the baudrate after opening QSerialPort?]]>In the QSerialport documentation（https://doc.qt.io/qt-6/qserialport.html#baudRate).In the prop, it is stated that:

Note: If the setting is set before opening the port, the actual serial port setting is done automatically in the QSerialPort::open() method right after that the opening of the port succeeds.

This sentence seems to tacitly allow changing the baudrate after opening QSerilPort, and after trying this, I found that serial communication is normal.

]]>https://forum.qt.io/topic/159430/is-it-forbidden-to-change-the-baudrate-after-opening-qserialportRSS for NodeFri, 15 May 2026 16:29:05 GMTMon, 28 Oct 2024 03:07:02 GMT60<![CDATA[Reply to Is it forbidden to change the baudrate after opening QSerialPort? on Mon, 28 Oct 2024 11:52:04 GMT]]>

This sentence seems to tacitly allow changing the baudrate after opening QSerilPort, and after trying this, I found that serial communication is normal.

Yes, you can change the properties (baud rate, data bits, stop bits, etc) in any time.

]]>https://forum.qt.io/post/813154https://forum.qt.io/post/813154Mon, 28 Oct 2024 11:52:04 GMT<![CDATA[Reply to Is it forbidden to change the baudrate after opening QSerialPort? on Mon, 28 Oct 2024 03:14:09 GMT]]>The same docs, "If the setting is successful or set before opening the port, returns true; otherwise returns false and sets an error code which can be obtained by accessing the value of the QSerialPort::error property. " So, if you get call setBaudRate() and get a true response then it worked.

]]>https://forum.qt.io/post/813109https://forum.qt.io/post/813109Mon, 28 Oct 2024 03:14:09 GMT