QModbusRtuSerialMaster Class

The QModbusRtuSerialMaster class represents a Modbus client that uses a serial bus for its communication with the Modbus server. 更多...

頭：	#include <QModbusRtuSerialMaster>
qmake:	QT += serialbus
Since:	Qt 5.8
繼承：	QModbusClient

該類在 Qt 5.8 引入。

所有成員列錶，包括繼承成員

公共函數

	QModbusRtuSerialMaster (QObject * parent = nullptr)
int	interFrameDelay () const
void	setInterFrameDelay (int microseconds )
void	setTurnaroundDelay (int turnaroundDelay )
int	turnaroundDelay () const

重實現保護函數

virtual void	close () override
virtual bool	open () override

詳細描述

Communication via Modbus requires the interaction between a single Modbus client instance and multiple Modbus servers. This class provides the client implementation via a serial port.

成員函數文檔編製

QModbusRtuSerialMaster:: QModbusRtuSerialMaster ( QObject * parent = nullptr)

Constructs a serial Modbus master with the specified parent .

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

重實現： QModbusDevice::close ().

int QModbusRtuSerialMaster:: interFrameDelay () const

Returns the amount of microseconds for the silent interval between two consecutive Modbus messages.

另請參閱 setInterFrameDelay ().

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

重實現： QModbusDevice::open ().

注意： When calling this function, existing buffered data is removed from the serial port.

void QModbusRtuSerialMaster:: 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.

注意： 若 microseconds 被設為 -1 或 microseconds is less than the pre-calculated delay then this pre-calculated value is used as frame delay.

另請參閱 interFrameDelay ().

void QModbusRtuSerialMaster:: setTurnaroundDelay ( int turnaroundDelay )

Sets the amount of milliseconds for the silent interval between a Modbus broadcast and a consecutive Modbus messages to turnaroundDelay . Typically the turnaround delay is in the range of 100 to 200 毫秒。

該函數在 Qt 5.13 引入。

另請參閱 turnaroundDelay ().

int QModbusRtuSerialMaster:: turnaroundDelay () const

Returns the amount of milliseconds for the silent interval between a Modbus broadcast and a consecutive Modbus messages. The default value is set to 100 毫秒。