一.线圈状态寄存器读写

• 项目效果如下
  

1. 写单个寄存器

• MODBUS_API int modbus_write_bit(modbus_t *ctx, int coil_addr, int status);

int addr=ui->spinBoxwirte_addr->value();
    int data=ui->spinBoxwirte_data->value();
    int ret = modbus_write_bit(mb,addr,data);

    if(ret!=1)
    {
        QMessageBox::information(this,"失败",
                                 "写状态寄存器失败，地址："+QString::number(data));
    }else
    {
        label_status->setText("写线圈状态寄存器成功！");
    }

2. 读单个寄存器

• int modbus_read_bits(modbus_t *ctx, int addr, int nb, uint8_t *dest);

int addr=ui->spinBoxRead_addr->value();
    int data=ui->spinBoxRead_data->value();
    //int modbus_read_bits(modbus_t *ctx, int addr, int nb, uint8_t *dest);
    uint8_t dest[4];
    int ret = modbus_read_bits(mb,addr,1,dest);

    if(ret!=1)
    {
        QMessageBox::information(this,"失败",
                                 "读状态寄存器失败，地址："+QString::number(data));
    }else
    {
        label_status->setText("读线圈状态寄存器成功！");
        qDebug()<<"读出的数据为："<<dest[0];
        ui->spinBoxRead_data->setValue(dest[0]);
    }

3. 写多个寄存器

• int modbus_write_bits(modbus_t *ctx, int addr, int nb, const uint8_t *data);

int addr=ui->spinBoxWriteMore_addr->value();

    //使用正则表达式，来处理字符串的分割
    QString  str = ui->textEdit_xianWrite->toPlainText();

    //用正则表达式进行分割
    QRegExp separator= QRegExp("\t|\n|\r\n|,| |;");

    //进行分割
    QStringList list =  str.split(separator,QString::SkipEmptyParts);

    uint8_t*value=new uint8_t[list.count()];

    for(int i=0;i<list.count();i++)
    {
        value[i]=list[i].toInt();
    }

    //int modbus_write_bits(modbus_t *ctx, int addr, int nb, const uint8_t *data);

    int ret = modbus_write_bits(mb,addr,list.count(),value);

    if(ret!=list.count())
    {
        QMessageBox::information(this,"写多个失败",
                                 "读状态寄存器失败，地址："+QString::number(addr));
         label_status->setText("写多个线圈状态寄存器失败！");
    }else
    {
        label_status->setText("写多个线圈状态寄存器成功！");
    }

    delete [] value;

4. 读多个寄存器

- int modbus_read_bits(modbus_t *ctx, int addr, int nb, uint8_t *dest);

ui->textEditRead_xian->clear();
    int addr=ui->spinBoxReadMorexian_addr->value();
    int count=ui->spinBoxReadMorexian_num->value();

    uint8_t *values = new uint8_t[count];

    //int modbus_read_bits(modbus_t *ctx, int addr, int nb, uint8_t *dest);
    int ret=modbus_read_bits(mb,addr,count,values);

    if(ret!=count)
    {
        QMessageBox::information(this,"读多个失败",
                                 "读状态寄存器失败，地址："+QString::number(addr));
         label_status->setText("读多个线圈状态寄存器失败！");
    }else
    {
        label_status->setText("读多个线圈状态寄存器成功！");
        QString str;
        for(int i=0;i<count;i++)
        {
            str+=QString::number(values[i])+"\t";
        }

        ui->textEditRead_xian->setText(str);

    }

    delete [] values;