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.