qt_modbusTCP_demo.rar

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QMessageBox> #include <QModbusTcpClient> #include <QModbusReply> #include <QModbusDataUnit> #include <QDebug> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); } MainWindow::~MainWindow() { delete ui; } QModbusTcpClient *My_client; //定义modbus连接客户端 /***************************** *连接PLC设备，通过modbus协议 * 郝军方20210526 ***************************/ void MainWindow::on_pushButtonConnect_clicked() { qDebug("connect"); QString ip=ui->lineEditIp->text();//从UI获取ip地址 QString port=ui->lineEditPort->text();//从UI获取端口信息 My_client=new QModbusTcpClient();//给连接实例化 My_client->setConnectionParameter(QModbusDevice::NetworkPortParameter,port);//配置连接端口 My_client->setConnectionParameter(QModbusDevice::NetworkAddressParameter,ip);//配置连接地址 My_client->setTimeout(3000);//配置超时3秒 My_client->setNumberOfRetries(3);//重复次数 if(My_client->connectDevice())//连接设备 { ui->pushButtonConnect->setText("connected"); } else { ui->pushButtonConnect->setText("not connect"); } qDebug()<<"连接状态:"<<My_client->state();//打印状态 } /***************** * *断开连接，将通讯断开 * * *****************/ void MainWindow::on_pushButtonDisconnect_clicked() { qDebug("disonnect"); QString ip=ui->lineEditIp->text(); QString port=ui->lineEditPort->text(); My_client->disconnectDevice();//断开设备 if(My_client->state()!=QModbusDevice::ConnectedState) { ui->pushButtonConnect->setText("connect"); } else { ui->pushButtonConnect->setText("not connect"); } } /*************************** *查看设备连接的状态 * * ************************/ void MainWindow::on_pushButton_clicked() { int stutic=My_client->state(); QString s=QString("return:%d").arg(stutic); QMessageBox::information(this,s,"stutic",QMessageBox::Ok,QMessageBox::NoButton); } /********************* * 读取线圈数据 * ******************/ void MainWindow::on_pushButtonRead_clicked() { int tag=ui->lineEditTag->text().toInt(); QModbusDataUnit readUnit(QModbusDataUnit::Coils,tag,1); if(auto *reply=My_client->sendReadRequest(readUnit,1)) { if(!reply->isFinished()) { connect(reply, &QModbusReply::finished,this,&MainWindow::readReady); } } } /********************* * 获取到读取线圈的返回值 * 操函数，返回的数据 * ******************/ void MainWindow::readReady() { QModbusReply *reply = qobject_cast<QModbusReply *>(sender()); if (!reply) return; qDebug("error:%d",reply->error()); if (reply->error() == QModbusDevice::NoError) { const QModbusDataUnit unit = reply->result(); // if(unit.startAddress()==30001){ bool res=unit.value(0); qDebug("result:%d",res); // QMessageBox::information(this,"return",QString(res),QMessageBox::Ok,QMessageBox::NoButton); // } QString r=QString::number(res); ui->lineEditValue->setText(r); } else { } reply->deleteLater(); // delete the reply } /************************** * 写线圈数据 * * ***********************/ void MainWindow::on_pushButtonWrite_clicked() { quint16 number1=static_cast<quint16>(1);//数据转化 int star_add=ui->lineEditTag->text().toInt();//ui获取写入地址 QModbusDataUnit writeUnit(QModbusDataUnit::Coils,star_add,number1);//写单元定义，线圈，首地址，数量 writeUnit.setValue(0,ui->lineEditValue->text().toInt());//设置写入单元的值 if(auto *reply=My_client->sendWriteRequest(writeUnit,1))//发送写入请求 { if(!reply->isFinished())//请求结束 { //连接操函数，匿名函数的写法 connect(reply, &QModbusReply::finished, this, [this, reply]() { //协议错误 if (reply->error() == QModbusDevice::ProtocolError) { qDebug() << (tr("Write response error: %1 (Mobus exception: 0x%2)") .arg(reply->errorString()).arg(reply->rawResult().exceptionCode(), -1, 16), 5000); //其他报错 } else if (reply->error() != QModbusDevice::NoError) { qDebug()<< (tr("Write response error: %1 (code: 0x%2)"). arg(reply->errorString()).arg(reply->error(), -1, 16), 5000); } //返回对象删除 reply->deleteLater(); }); } } } /*************************** *读取保存寄存器 * * *************************/ void MainWindow::on_pushButton_readRegister_clicked() { qDebug()<<"进入"<<endl; int star_add=ui->lineEditTag->text().toInt();//其实地址从ui获取 QModbusDataUnit ReadUnit(QModbusDataUnit::HoldingRegisters,star_add,1);//定义读取模块单元 qDebug()<<"寄存器进入"<<endl; try { if(!My_client) return; if(My_client->state()!=QModbusDevice::ConnectedState) return; if(auto *reply=My_client->sendReadRequest(ReadUnit,1))//发送读取到设备 { if(!reply->isFinished())//读取结束 { qDebug()<<"连接"; //消息调用读取寄存器槽函数 connect(reply,&QModbusReply::finished,this,&MainWindow::readRegister); } else { //清除内存 delete reply; } } } catch (QString ex) { qDebug()<<ex<<endl; } } /*********************** *读取寄存器槽函数 * * *********************/ void MainWindow::readRegister() { QModbusReply *replyer=qobject_cast<QModbusReply *>(sender());//将sender转化为modbus返回对象 if(!replyer) { return; } qDebug()<<replyer->error();//打印error数据 if(replyer->error()==QModbusDevice::NoError)//如果返回的error为no error时，需要将数据显示在ui { const QModbusDataUnit unit = replyer->result(); uint16_t res=unit.value(0); qDebug()<<res<<endl; QString r=QString::number(res);//数据转化为QString ui->lineEditValue->setText(r); } else { qDebug()<< (tr("Write response error: %1 (code: 0x%2)"). arg(replyer->errorString()).arg(replyer->error(), -1, 16), 5000); } replyer->deleteLater(); } /*************************** * 写存储寄存器槽函数 * * *************************/ void MainWindow::on_pushButton_writeRegister_clicked() { qDebug()<<"准备写入holding寄存器数据 "; int star_add=ui->lineEditTag->text().toInt(); int value=ui->lineEditValue->text().toInt(); QModbusDataUnit writeUnit(QModbusDataUnit::HoldingRegisters,star_add,1);//定义数据写入单元 // quint16 hex1=static_cast<quint16>(number); writeUnit.setValue(0,value);//设置写入单元值 try { if (auto *reply = My_client->sendWriteRequest(writeUnit, 1)) {// sendWriteRequest是向服务器写数据 if (!reply->isFinished()) { //reply Returns true when the reply has finished or was aborted. //lambda表达式触发槽函数， connect(reply, &QModbusReply::finished, this, [this, reply]() { qDebug()<<"写入返回："<<reply->error()<<endl; qDebug()<<reply->result().values().first(); if (reply->error() == QModbusDevice::ProtocolError) { qDebug() << (tr("Write response error: %1 (Mobus exception: 0x%2)") .arg(rep