Problem sending data via the serial port to the XBee radio module via the RS232 cable

[SALA-BANAKISSA]

I have a problem opening the COM1 and communication to the xbee, I came writing even a single character even read what I get, is that a person of good will could help me if please? this is urgent, thank you.

Here is the code of my program:

connect(Bouton1, SIGNAL(clicked()), this, SLOT(on_pushButton_3_clicked()));

void Interface::on_pushButton_3_clicked()
{
// const QTime *temp ;

//Si on clique sur "Start"
      if(validStart == true)
      {

           // Permet de savoir que le bouton est en mode "Stop"

          validStart = false;

         connect(m_timer, SIGNAL(timeout()), this, SLOT(update()));

          // On déclenche le départ du Timer

          m_timer->start(1000);

          serialTimer->setSingleShot(true);

          QObject ::connect(this, SIGNAL(writeRequest(QByteArray)), this, SLOT(writeSerial(QByteArray)));

          QObject ::connect(serial, SIGNAL(readyRead()), this, SLOT(handleResponse()));

          QObject ::connect(serialTimer, SIGNAL(timeout()), this, SLOT(processTimeout()));


      }
      // Si on clique sur "Stop"

      else
      {
          // Permet de savoir que le bouton est en mode "Start"

          validStart = true;

          // On arrête le compteur

          m_timer->stop();
      }

}

voiid Interface::writeSerial(QByteArray C)
{

serial->open(QIODevice::ReadWrite);

serial->setBaudRate(9600);

if (serial->portName()!= "COM1") 

{

    serial->close();

    serial->setPortName("COM1");


    if (!serial->open(QIODevice::ReadWrite)) {

        processError(tr("Can't open %1, error code %2").arg(serial->portName()).arg(serial->error()));

        return;

    }

    if (!serial->setBaudRate(QSerialPort::Baud19200)) 

{
processError(tr("Can't set rate 19200 baud to port %1, error code %2")
.arg(serial->portName()).arg(serial->error()));

        return;

    }

    if (!serial->setDataBits(QSerialPort::Data8))

{
processError(tr("Can't set 8 data bits to port %1, error code %2")
.arg(serial->portName()).arg(serial->error()));

        return;
    }

    if (!serial->setParity(QSerialPort::NoParity)) 

{

        processError(tr("Can't set no patity to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));

        return;
    }

    if (!serial->setStopBits(QSerialPort::OneStop))

{
processError(tr("Can't set 1 stop bit to port %1, error code %2")
.arg(serial->portName()).arg(serial->error()));

        return;

    }

    if (!serial->setFlowControl(QSerialPort::NoFlowControl)) 

{
processError(tr("Can't set no flow control to port %1, error code %2")
.arg(serial->portName()).arg(serial->error()));

        return;

    }
}


qDebug() << "Message written";

this->msgRequest = "O";

serial->write(msgRequest);

serialTimer->start(400);

}

[SGaist]

Isn't this thread a duplicate of "this":http://qt-project.org/forums/viewthread/39539/ ?