QModbusRtuSerialMaster Class

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

Header:	#include <QModbusRtuSerialMaster>
qmake:	QT += serialbus
Since:	Qt 5.8
Inherits:	QModbusClient

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

Public Functions

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

• 8 public functions inherited from QModbusClient
• 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

• 2 protected functions inherited from QModbusClient
• 4 protected functions inherited from QModbusDevice
• 9 protected functions inherited from QObject

Additional Inherited Members

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

Detailed Description

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

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.

Member Function Documentation

QModbusRtuSerialMaster::QModbusRtuSerialMaster(QObject *parent = nullptr)

Constructs a serial Modbus master with the specified parent.

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

Reimplemented from QModbusDevice::close().

int QModbusRtuSerialMaster::interFrameDelay() const

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

See also setInterFrameDelay().

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

Reimplemented from QModbusDevice::open().

Note: 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.

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().