class QModbusRtuSerialServer#

The QModbusRtuSerialServer class represents a Modbus server that uses a serial port for its communication with the Modbus client. More…

Synopsis#

Methods#

def __init__()
def interFrameDelay()
def setInterFrameDelay()

Note

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Detailed Description#

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

Since multiple Modbus server instances can interact with a Modbus client at the same time (using a serial bus), servers are identified by their serverAddress() .

__init__([parent=None])#

Parameters:: parent – QObject

Constructs a QModbusRtuSerialServer with the specified parent. The serverAddress preset is 1.

interFrameDelay()#

Return type:: int

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

See also

setInterFrameDelay()

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.