class QModbusRtuSerialClient#

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

Inheritance diagram of PySide6.QtSerialBus.QModbusRtuSerialClient

Synopsis#

Methods#

Note

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Detailed Description#

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.

__init__([parent=None])#
Parameters:

parentQObject

Constructs a serial Modbus client with the specified parent.

interFrameDelay()#
Return type:

int

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

setInterFrameDelay(microseconds)#
Parameters:

microseconds – int

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.

setTurnaroundDelay(turnaroundDelay)#
Parameters:

turnaroundDelay – int

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 milliseconds.

turnaroundDelay()#
Return type:

int

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 milliseconds.