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> |
Inherits: | QModbusServer |
Public Functions
QModbusRtuSerialServer(QObject *parent = nullptr) | |
virtual | ~QModbusRtuSerialServer() |
int | interFrameDelay() const |
void | setInterFrameDelay(int microseconds) |
Reimplemented Public Functions
virtual bool | processesBroadcast() const override |
Protected Functions
QModbusRtuSerialServer(QModbusRtuSerialServerPrivate &dd, QObject *parent = nullptr) |
Reimplemented Protected Functions
virtual void | close() override |
virtual bool | open() override |
virtual QModbusResponse | processRequest(const QModbusPdu &request) override |
Detailed Description
\inmodule
QtSerialBus \since
6.2
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
.
[protected]
QModbusRtuSerialServer::QModbusRtuSerialServer(QModbusRtuSerialServerPrivate &dd, QObject *parent = nullptr)
\internal
[virtual noexcept]
QModbusRtuSerialServer::~QModbusRtuSerialServer()
Destroys the QModbusRtuSerialServer instance.
[override virtual protected]
void QModbusRtuSerialServer::close()
Reimplements: QModbusDevice::close().
int QModbusRtuSerialServer::interFrameDelay() const
\since
6.2
Returns the amount of microseconds for the silent interval between two consecutive Modbus messages.
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.
void QModbusRtuSerialServer::setInterFrameDelay(int microseconds)
\since
6.2
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.
See also interFrameDelay().