QModbusTcpServer Class

The QModbusTcpServer class represents a Modbus server that uses a TCP server for its communication with the Modbus client. 更多...

頭：	#include <QModbusTcpServer>
qmake:	QT += serialbus
Since:	Qt 5.8
繼承：	QModbusServer

該類在 Qt 5.8 引入。

所有成員列錶，包括繼承成員

公共函數

	QModbusTcpServer (QObject * parent = nullptr)
virtual	~QModbusTcpServer ()
void	installConnectionObserver (QModbusTcpConnectionObserver * observer )

信號

void	modbusClientDisconnected (QTcpSocket * modbusClient )

重實現保護函數

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

詳細描述

Communication via Modbus requires the interaction between a single Modbus client instance and single Modbus server. This class provides the Modbus server implementation via a TCP server.

Modbus TCP networks can have multiple servers. Servers are read/written by a client device represented by QModbusTcpClient .

成員函數文檔編製

QModbusTcpServer:: QModbusTcpServer ( QObject * parent = nullptr)

Constructs a QModbusTcpServer with the specified parent 。 serverAddress 預置為 255 .

`[signal]` void QModbusTcpServer:: modbusClientDisconnected ( QTcpSocket * modbusClient )

This signal is emitted when a current TCP based modbusClient disconnects from this Modbus TCP server. Note that there might be several TCP clients connected at the same time.

Notifications on incoming new connections can be received by installing a QModbusTcpConnectionObserver 憑藉 installConnectionObserver ().

該函數在 Qt 5.13 引入。

另請參閱 installConnectionObserver .

`[虛擬]` QModbusTcpServer:: ~QModbusTcpServer ()

銷毀 QModbusTcpServer 實例。

`[override virtual protected]` void QModbusTcpServer:: close ()

重實現： QModbusDevice::close ().

void QModbusTcpServer:: installConnectionObserver ( QModbusTcpConnectionObserver * observer )

Installs an observer that can be used to obtain notifications when a new TCP client connects to this server instance. In addition, the observer can be used to reject the incoming TCP connection.

QModbusTcpServer takes ownership of the given observer . Any previously set observer will be deleted. The observer can be uninstalled by calling this function with nullptr as parameter.

該函數在 Qt 5.13 引入。

另請參閱 QModbusTcpConnectionObserver .

`[override virtual protected]` bool QModbusTcpServer:: open ()

重實現： QModbusDevice::open ().

`[override virtual protected]` QModbusResponse QModbusTcpServer:: processRequest (const QModbusPdu & request )

重實現： QModbusServer::processRequest (const QModbusPdu &request).

Processes the Modbus client request specified by request and returns a Modbus response.

The following Modbus function codes are filtered out as they are serial line only according to the Modbus Application Protocol Specification 1.1b:

A request to the TCP server will be answered with a Modbus exception response with the exception code QModbusExceptionResponse::IllegalFunction .