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QModbusResponse Class

QModbusResponse is a container class containing the function code and payload that is stored inside a Modbus ADU. More...

Header: #include <QModbusResponse>
qmake: QT += serialbus
Since: Qt 5.8
Inherits: QModbusPdu
Inherited By:

QModbusExceptionResponse

This class was introduced in Qt 5.8.

Public Types

(alias) CalcFuncPtr

Detailed Description

A typical Modbus response can looks like this:

 QModbusResponse response(QModbusResponse::ReadCoils, QByteArray::fromHex("02cd01"));

Note: When using the constructor taking the QByteArray, please make sure to convert the containing data to big-endian byte order before creating the request.

The same response can be created like this, if the values are known at compile time:

 quint8 payloadInBytes = 2, outputHigh = 0xcd, outputLow = 0x01;
 QModbusResponse response(QModbusResponse::ReadCoils, payloadInBytes, outputHigh, outputLow);

Member Type Documentation

[alias] QModbusResponse::CalcFuncPtr

This is a type alias for decltype(&calculateDataSize).

Typedef for a pointer to a custom calculator function with the same signature as QModbusResponse::calculateDataSize.

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