The QModbusTcpServer class represents a Modbus server that uses a TCP server for its communication with the Modbus client. 更多...
| 头： | #include <QModbusTcpServer> |
| qmake: | QT += serialbus |
| Since: | Qt 5.8 |
| 继承： | QModbusServer |
| QModbusTcpServer (QObject * parent = nullptr) | |
| virtual | ~QModbusTcpServer () |
| void | installConnectionObserver (QModbusTcpConnectionObserver * observer ) |
| void | modbusClientDisconnected (QTcpSocket * modbusClient ) |
| virtual void | close () override |
| virtual bool | open () override |
| virtual QModbusResponse | processRequest (const QModbusPdu & request ) override |
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 .
Constructs a QModbusTcpServer with the specified
parent
。
serverAddress
preset is
255
.
[signal, since 5.13]
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 凭借 installConnectionObserver ().
该函数在 Qt 5.13 引入。
另请参阅 installConnectionObserver .
[虚拟]
QModbusTcpServer::
~QModbusTcpServer
()
销毁 QModbusTcpServer 实例。
[override virtual protected]
void
QModbusTcpServer::
close
()
重实现： QModbusDevice::close ().
[since 5.13]
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.
该函数在 Qt 5.13 引入。
另请参阅 QModbusTcpConnectionObserver .
[override virtual protected]
bool
QModbusTcpServer::
open
()
重实现： QModbusDevice::open ().
[override virtual protected]
QModbusResponse
QModbusTcpServer::
processRequest
(const
QModbusPdu
&
request
)
重实现： 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.