Not getting the correct response from hardware?

Mohit Tripathi

#include "dialog.h"
#include "ui_dialog.h"

#include <QApplication>

#include <QtSerialPort>


template <class T> bool hasError(const QIODevice & d) {
    return qobject_cast<const T *>(&d) && static_cast<const T &>(d).error() != T::NoError;
}

void chkError(const QIODevice & d) {
    if (hasError<QFile>(d) || hasError<QSerialPort>(d))
        qFatal("I/O Error on %s: %s", d.objectName().toLocal8Bit().constData(),
               d.errorString().toLocal8Bit().constData());
}

void logData(QTextStream & log, const QByteArray & data) {
    log << data.toHex() << "\nLength: " << data.size() << "\n\n";
    log.flush();
    //  chkError(*log.device());
}

void transmit(QSerialPort & port, const QByteArray & data) {
    port.write(data);
    qDebug() << "\nWrote" << data.size() << ":" << data.toHex().constData();
    chkError(port);
    // logData(log, data);
}

void receive(QSerialPort & port) {
    auto data = port.readAll();
    qDebug() << "\nRead" << data.size() << ":" << data.toHex().constData();
    // chkError(port);
    //logData(log, data);
}

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
  //  QCoreApplication app(argc, argv);

    QFile logFile("Data.txt");
    if (!logFile.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text))
        qFatal("Can't open the log file: %s", logFile.errorString().toLocal8Bit().constData());
    QTextStream log(&logFile);

    QSerialPort port;
    port.setPortName("COM5");
    port.setBaudRate(QSerialPort::Baud9600);
    port.setDataBits(QSerialPort::Data8);
    port.setParity(QSerialPort::EvenParity);
    port.setStopBits(QSerialPort::OneStop);
    port.setFlowControl(QSerialPort::NoFlowControl);

    if (!port.open(QIODevice::ReadWrite))
        qFatal("Can't open the serial port: %s", port.errorString().toLocal8Bit().constData());

    logFile.setObjectName("Log File");
    port.setObjectName("Serial Port");

    const QByteArray sendPacket = QByteArrayLiteral("\x7E\x03\x00\x00\x02\x00\x02\x03\x02\x06\x00\x01\x02\x00\x09\x00\x01\x02\x02");

    transmit(port, sendPacket);
//        transmit(serial, sendPacket);
        while(port.waitForReadyRead(5000))
        {
           receive(port);
           QTimer::singleShot(300, this, SLOT(quit()));
        }

}

Dialog::~Dialog()
{
    delete ui;
}

Hi, I am getting the response but wrong. I am getting the address and function code same as query but, not other values here. Can I know " what I am doing wrong in this?
Note: I am getting the correct response in Hercules software.

SGaist

Hi,

What exactly are you sending ?
What exactly are you getting ?
What exactly are you expecting ?

Out of curiosity, why not use the asynchronous nature of QSerialPort ?