class QModbusResponse#

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

Inheritance diagram of PySide6.QtSerialBus.QModbusResponse

Inherited by: QModbusExceptionResponse

Synopsis#

Methods#

Static functions#

Note

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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);
__init__()#

Constructs an invalid QModbusResponse .

__init__(pdu)
Parameters:

pduQModbusPdu

Constructs a copy of pdu.

__init__(code[, newData=QByteArray()])
Parameters:

Constructs a QModbusResponse with function code set to code and payload set to data. The data is expected to be stored in big-endian byte order already.

static calculateDataSize(pdu)#
Parameters:

pduQModbusResponse

Return type:

int

Calculates the expected data size for response, based on the response’s function code and data. Returns the full size of the response’s data part; -1 if the size could not be properly calculated.

See also

minimumDataSize registerDataSizeCalculator

static minimumDataSize(pdu)#
Parameters:

pduQModbusResponse

Return type:

int

Returns the expected minimum data size for response based on the response’s function code; -1 if the function code is not known.