Modbus Master example

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 #ifndef WRITEREGISTERMODEL_H
 #define WRITEREGISTERMODEL_H

 #include <QAbstractItemModel>
 #include <QBitArray>
 #include <QObject>

 class WriteRegisterModel : public QAbstractTableModel
 {
     Q_OBJECT

 public:
     WriteRegisterModel(QObject *parent = nullptr);

     int rowCount(const QModelIndex &parent = QModelIndex()) const override;
     int columnCount(const QModelIndex &parent = QModelIndex()) const override;

     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
     QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
     bool setData(const QModelIndex &index, const QVariant &value, int role) override;

     Qt::ItemFlags flags(const QModelIndex &index) const override;

 public slots:
     void setStartAddress(int address);
     void setNumberOfValues(const QString &number);

 signals:
     void updateViewport();

 public:
     int m_number;
     int m_address;
     QBitArray m_coils;
     QVector<quint16> m_holdingRegisters;
 };

 #endif // WRITEREGISTERMODEL_H