QModbusRtuSerialSlave Class
The QModbusRtuSerialSlave class represents a Modbus server that uses a serial port for its communication with the Modbus client. More...
| Header: | #include <QModbusRtuSerialSlave> |
| qmake: | QT += serialbus |
| Since: | Qt 5.8 |
| Inherits: | QModbusServer |
This class was introduced in Qt 5.8.
Public Functions
| QModbusRtuSerialSlave(QObject *parent = nullptr) | |
| virtual | ~QModbusRtuSerialSlave() |
Reimplemented Public Functions
| virtual bool | processesBroadcast() const override |
Reimplemented Protected Functions
| virtual void | close() override |
| virtual bool | open() override |
| virtual QModbusResponse | processRequest(const QModbusPdu &request) override |
Detailed Description
Communication via Modbus requires the interaction between a single Modbus client instance and multiple Modbus server. This class provides the Modbus server implementation via a serial port.
Since multiple Modbus server instances can interact with a Modbus client at the same time (using a serial bus), servers are identified by their serverAddress().
Member Function Documentation
QModbusRtuSerialSlave::QModbusRtuSerialSlave(QObject *parent = nullptr)
Constructs a QModbusRtuSerialSlave with the specified parent. The serverAddress preset is 1.
[virtual] QModbusRtuSerialSlave::~QModbusRtuSerialSlave()
Destroys the QModbusRtuSerialSlave instance.
[override virtual protected] void QModbusRtuSerialSlave::close()
Reimplements: QModbusDevice::close().
[override virtual protected] bool QModbusRtuSerialSlave::open()
Reimplements: QModbusDevice::open().
Note: When calling this function, existing buffered data is removed from the serial port.
[override virtual protected] QModbusResponse QModbusRtuSerialSlave::processRequest(const QModbusPdu &request)
Reimplements: QModbusServer::processRequest(const QModbusPdu &request).
Processes the Modbus client request specified by request and returns a Modbus response.
The Modbus function QModbusRequest::EncapsulatedInterfaceTransport with MEI Type 13 (0x0D) CANopen General Reference is filtered out because it is usually Modbus TCP or Modbus serial ASCII only.
A request to the RTU serial slave will be answered with a Modbus exception response with the exception code QModbusExceptionResponse::IllegalFunction.
[override virtual] bool QModbusRtuSerialSlave::processesBroadcast() const
Reimplements: QModbusServer::processesBroadcast() const.
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