Qt Serial Port Rs485
Qt Serial Port Rs485
Oct 25, 2016 - 1.3 Connect BE230E1 Device to PC. 2.3.2 Qt Serial Port API. To verify UART functionality, used for RS232/RS485 connection.
Qt Serial Port Example
Yes, waitForBytesWritten isn't going to solve that. Only other thing you can do is sleep for a while after the wait call, thus giving the device some time to process the command you have just written. Exactly how long to sleep is of course a blind guess, it is not necessarily a constant. Do focus on enabling handshaking first, typically ignored too often. QSerialPort::setFlowControl function.
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Expansion Card
A decent device will use its RTS signal to turn off your CTS input (Clear to Send) when it isn't ready to receive anything. CTS/RTS handshaking is supported by Qt, you use QSerialPort::HardwareControl.