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https://bravikov.wordpress.com/2014/05/28/qextserialport-read-%d0%b8-%d1%82%d0%b0%d0%b9%d0%bc%d0%b0%d1%83%d1%82-%d0%b2-%d0%b2%d0%b8%d0%bd%d0%b4%d0%be%d1%83%d1%81/
QextSerialPort::read() и таймаут в Виндоус