ModbusClient

Description

The ModbusClient object is the base class for all Modbus clients (masters) and manages a number of Modbus slaves to communicate with.

› Inherits:

ModbusDevice

› Inherited by:

ModbusRtuMaster, ModbusTcpClient

Overview

Properties

numberOfRetries slaves timeout ModbusDevice.activityLed ModbusDevice.autoConnect

ModbusDevice.error ModbusDevice.errorString ModbusDevice.state Object.objectId Object.parent

Methods

pollSlaves() ModbusDevice.connectDevice() ModbusDevice.disconnectDevice() Object.deserializeProperties() Object.fromJson() Object.serializeProperties() Object.toJson()

Signals

slavesDataChanged() ModbusDevice.connected() ModbusDevice.disconnected() ModbusDevice.errorOccurred() Object.completed()

Enumerations

ModbusDevice.BusInterface ModbusDevice.Error ModbusDevice.State

Properties

numberOfRetries

This property holds the number of retries a client will perform before a request fails.

› Type:

SignedInteger

› Default:

3

› Signal:

numberOfRetriesChanged()

› Attributes:

Writable

slaves

This property holds a list of all slaves.

› Type:

List<ModbusSlave>

› Signal:

slavesChanged()

› Attributes:

Readonly

timeout

This property holds the timeout value used by this client

› Type:

SignedInteger

› Default:

1000

› Signal:

timeoutChanged()

› Attributes:

Writable

Methods

pollSlaves()

This method polls the slaves property. It is called automatically when using a Polling property modifier on this property and usually does not have to be called manually.

Signals

slavesDataChanged(SignedInteger index)

This signal is emitted whenever the List.dataChanged() signal is emitted, i.e. the item at index in the slaves list itself emitted the dataChanged() signal.