Development of a Serial Communication Upper Computer using QtQT

In the modern field of industrial automation, serial communication technology is a very common method of data transmission. It is characterized by its low cost, high stability, and fast transmission speed, and is widely used in the communication between various electronic devices. To make better use of this technology, QT development offers an excellent solution. This article will detail how to implement a serial communication upper computer using QT development.

QT is a cross-platform C++ graphical user interface application development framework with a rich set of controls and powerful functionality. Utilizing QT for developing a serial communication upper computer enables data transmission, data display, and device control between devices. Here are the detailed steps for the development process:

Installing the Qt Development Environment

First, download and install the Qt development environment. Choose the appropriate version for your operating system and proceed with the installation. After installation, configure the relevant environment variables to ensure that Qt Creator runs smoothly.

Creating a New Qt Project

Open Qt Creator, select “File” – “New File or Project,” choose “Application” – “Qt Widgets Application,” then set the project name and save location, click “Next,” and complete the project creation.

Configuring the Serial Port

In the Qt project, you can use the QSerialPort class to implement serial communication. First, set the serial port parameters such as baud rate, data bits, stop bits, and parity. After project creation, open the mainwindow.ui interface design file, go to “Tools” – “Properties,” find the “Serial Port” tab, and make the necessary settings.

Initializing the Serial Port

In the mainwindow.cpp file, you need to implement the initialization of the serial port. First, include the header file:

cpp

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#include <QSerialPort>

Then, within the mainwindow class, define a QSerialPort object and implement the initialization function:

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m_serialPort = new QSerialPort(this);

m_serialPort->setPortName("COM1"); // Set the serial port name

m_serialPort->setBaudRate(QSerialPort::Baud9600); // Set the baud rate

m_serialPort->setDataBits(QSerialPort::Data8); // Set the data bits

m_serialPort->setParity(QSerialPort::NoParity); // Set the parity bit

m_serialPort->setStopBits(QSerialPort::OneStop); // Set the stop bits

m_serialPort->setFlowControl(QSerialPort::NoFlowControl); // Set the flow control

if (!m_serialPort->open(QIODevice::ReadWrite)) {
    qDebug() << "Unable to open serial port!";
}

Implementing Data Reception and Transmission

To enable data transmission between devices, you need to implement data reception and transmission functions. Add the following functions to the mainwindow class:

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void MainWindow::readData()
{
    QByteArray data = m_serialPort->readAll(); // Read serial port data
    // Process the received data
}

void MainWindow::writeData(const QString &data)
{
    m_serialPort->write(data.toLocal8Bit()); // Send data to the serial port
}

Connecting Signals and Slots

To make the serial communication function properly, you also need to connect signals to slots. Add the following code to the mainwindow class:

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connect(m_serialPort, &QSerialPort::readyRead, this, &MainWindow::readData); // Connect the serial port data arrival signal

connect(ui->pushButton_send, &QPushButton::clicked, this, &MainWindow::writeData); // Connect the send button signal

Compiling and Running

After completing the above steps, you can compile and run the project. If everything is normal, you should see the serial communication upper computer running successfully, achieving data transmission, data display, and device control between devices.

In summary, using QT to develop a serial communication upper computer is a very convenient and efficient method. Through the above steps, you can easily achieve data transmission between devices, meeting the needs of various industrial automation scenarios.