QModbusRtuSerialServer Class
The QModbusRtuSerialServer class represents a Modbus server that uses a serial port for its communication with the Modbus client. More...
| Header: | #include <QModbusRtuSerialServer> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS SerialBus) target_link_libraries(mytarget PRIVATE Qt6::SerialBus) |
| qmake: | QT += serialbus |
| Since: | Qt 6.2 |
| Inherits: | QModbusServer |
Public Functions
| QModbusRtuSerialServer(QObject *parent = nullptr) | |
| virtual | ~QModbusRtuSerialServer() |
(since 6.2) int | interFrameDelay() const |
(since 6.2) void | setInterFrameDelay(int microseconds) |
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
[explicit] QModbusRtuSerialServer::QModbusRtuSerialServer(QObject *parent = nullptr)
Constructs a QModbusRtuSerialServer with the specified parent. The serverAddress preset is 1.
[virtual noexcept] QModbusRtuSerialServer::~QModbusRtuSerialServer()
Destroys the QModbusRtuSerialServer instance.
[override virtual protected] void QModbusRtuSerialServer::close()
Reimplements: QModbusDevice::close().
[since 6.2] int QModbusRtuSerialServer::interFrameDelay() const
Returns the amount of microseconds for the silent interval between two consecutive Modbus messages.
This function was introduced in Qt 6.2.
See also setInterFrameDelay().
[override virtual protected] bool QModbusRtuSerialServer::open()
Reimplements: QModbusDevice::open().
Note: When calling this function, existing buffered data is removed from the serial port.
[override virtual protected] QModbusResponse QModbusRtuSerialServer::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 server will be answered with a Modbus exception response with the exception code QModbusExceptionResponse::IllegalFunction.
[override virtual] bool QModbusRtuSerialServer::processesBroadcast() const
Reimplements: QModbusServer::processesBroadcast() const.
[since 6.2] void QModbusRtuSerialServer::setInterFrameDelay(int microseconds)
Sets the amount of microseconds for the silent interval between two consecutive Modbus messages. By default, the class implementation will use a pre-calculated value according to the Modbus specification. A active or running connection is not affected by such delay changes.
Note: If microseconds is set to -1 or microseconds is less than the pre-calculated delay then this pre-calculated value is used as frame delay.
This function was introduced in Qt 6.2.
See also interFrameDelay().