Connect ReadyRead-Signal with Slot

[mikrocat]

Hi,
I am working on a project another student has written.
I don't like the way he handled reading from the SerialPort:

settings->RS485port.write(dataToSend);
if(settings->RS485port.waitForReadyRead(1)){
            QByteArray temp = settings->RS485port.readAll();
 
            for(int charCount = 0; charCount < temp.count(); charCount++){
                ...... //handling the response
            }
                byteReceived = true;
            }
        }

settings->RS485port.write(dataToSend);
if(settings->RS485port.waitForReadyRead(1)){
            QByteArray temp = settings->RS485port.readAll();

            for(int charCount = 0; charCount < temp.count(); charCount++){
                ...... //handling the response
            }
                byteReceived = true;
            }
        }

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waitForReadyRead let the GUI freeze and that's definitely not what i want to happen. So i read about connecting the readyRead Signal with a Slot.

connect(settings->RS485port, SIGNAL(readyRead()), this, SLOT(handlePortReadyRead()));

connect(settings->RS485port, SIGNAL(readyRead()), this, SLOT(handlePortReadyRead()));

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If I try to compile this, it says:

C:\Users\...\bootloaderdialog.cpp:207: Fehler: no matching function for call to 'BootloaderDialog::connect(QSerialPort&, const char [13], BootloaderDialog* const, const char [23])'
connect(settings->RS485port, SIGNAL(readyRead()), this, SLOT(handlePortReadyRead()));

Do you know why i can't connect the Signal to the Slot. Or do you know any better way to read Data from a Serialport?