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

• List of all members, including inherited members
• Obsolete members

Public Functions

	QModbusRtuSerialSlave(QObject *parent = nullptr)
virtual	~QModbusRtuSerialSlave()

Reimplemented Public Functions

virtual bool

processesBroadcast() const override

• 10 public functions inherited from QModbusServer
• 7 public functions inherited from QModbusDevice
• 31 public functions inherited from QObject

Static Public Members

const QMetaObject

staticMetaObject

• 9 static public members inherited from QObject

Reimplemented Protected Functions

virtual void	close() override
virtual bool	open() override
virtual QModbusResponse	processRequest(const QModbusPdu &request) override

• 4 protected functions inherited from QModbusServer
• 4 protected functions inherited from QModbusDevice
• 9 protected functions inherited from QObject

Additional Inherited Members

• 1 property inherited from QObject
• 1 public slot inherited from QObject
• 1 signal inherited from QModbusServer
• 2 signals inherited from QModbusDevice
• 2 signals inherited from QObject
• 4 protected functions inherited from QModbusServer
• 4 protected functions inherited from QModbusDevice
• 9 protected functions inherited from QObject

Detailed Description

The QModbusRtuSerialSlave class represents a Modbus server that uses a serial port for its communication with the Modbus client.

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()

Reimplemented from QModbusDevice::close().

[override virtual protected] bool QModbusRtuSerialSlave::open()

Reimplemented from 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)

Reimplemented from QModbusServer::processRequest().

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

Reimplemented from QModbusServer::processesBroadcast().