[SOLVED]QSerialPort - send command AT

bkerdev

Hello everyone.
I would like to ask you how to send AT command to a 3G modem (HUAWEI E153 Mobile Broadband).
I can open the port for reading and writing.
But when I send an AT command he answers me. But this is not the answer I expected.

Currently I use
Qt 5.1.0
Qt Creator 2.7.2
Mac OS X 10.7.5

My source
@
// Test de dialogue avec le port
QSerialPort myPort;
myPort.setPortName("HUAWEIMobile-Modem");

QString str = "AT";
str.append(QChar(10));

if(myPort.open(QIODevice::ReadWrite)){
    qDebug() << "Port Open...";

    //Default configuration

// qDebug() << "Baud rate:" << myPort.baudRate();
// qDebug() << "Data bits:" << myPort.dataBits();
// qDebug() << "Stop bits:" << myPort.stopBits();
// qDebug() << "Parity:" << myPort.parity();
// qDebug() << "Flow control:" << myPort.flowControl();
// qDebug() << "Read buffer size:" << myPort.readBufferSize();

    //Configuration du port
    myPort.setBaudRate(460800);
    myPort.setParity(QSerialPort::NoParity);
    myPort.setFlowControl(QSerialPort::NoFlowControl);
    myPort.setDataBits(QSerialPort::Data8);
    myPort.setStopBits(QSerialPort::OneStop);

    //Send command
    if(myPort.isWritable()){
        qDebug() <<"Writting...";
        myPort.write(str.toLocal8Bit());
        qDebug() << "End Writting.." << endl;
    }else
        qDebug() << myPort.errorString();

    // Lecture du port
    if(myPort.isReadable()) {
        qDebug() <<"Reading...";
        if(myPort.waitForReadyRead(60)) {
            QString out;
            qDebug() << out.fromLocal8Bit(myPort.readAll());
        } else {
            qDebug() <<"ERROR : " << myPort.errorString();
        }
    }else
        qDebug() << myPort.errorString();

    myPort.close();
}else
    qDebug() << myPort.errorString();
@

My Output
@Port Open...
Writting...
End Writting...
Reading...
"AT
"@

Normal Output
@Port Open...
Writting...
End Writting...
Reading...
"OK"@

kuzulis

Hi.

You can test the "AT" commands with use an Terminal example application (please look in QtSerialPort examples).

Regarding to your problem: you shall send to the modem the strings that terminated by symbols of new line and so on, like "AT\n", "AT\n\r" and so on.

PS: It is not QtSerialPort problem!

bkerdev

I look at the example code from the terminal and it should send the data character by character to the port. And the end I add
@QChar (13)@

to validate the information.