ModbusRtuSlave

Description

The ModbusRtuSlave object implements a Modbus RTU slave which communicates with a Modbus RTU master via a serial port.

This object was introduced in InCore 2.0.

› Inherits:

ModbusServer

Overview

Properties

baudRate busInterface dataBits parity portName

stopBits ModbusServer.address ModbusServer.registers ModbusDevice.activityLed ModbusDevice.autoConnect

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

Methods

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

Signals

ModbusServer.dataErrorOccurred() ModbusServer.mapErrorOccurred() ModbusServer.registersDataChanged() ModbusDevice.connected() ModbusDevice.disconnected() ModbusDevice.errorOccurred() Object.completed()

Enumerations

ModbusDevice.BusInterface ModbusDevice.Error ModbusDevice.State

Properties

baudRate

This property holds the data baud rate of the serial port used for communicating with the Modbus RTU master.

› Type:

SerialPort.BaudRate

› Default:

SerialPort.Baud115200

› Signal:

baudRateChanged()

› Attributes:

Writable

busInterface

This property holds the bus interface to use for communication. See the BusInterface enumeration for details.

This property was introduced in InCore 2.8.

› Type:

BusInterface

› Default:

ModbusDevice.SerialPort

› Signal:

busInterfaceChanged()

› Attributes:

Writable

dataBits

This property holds the number of data bits of the serial port used for communicating with the Modbus RTU master.

› Type:

SerialPort.DataBits

› Default:

SerialPort.Data8

› Signal:

dataBitsChanged()

› Attributes:

Writable

parity

This property holds the parity mode of the serial port used for communicating with the Modbus RTU master.

› Type:

SerialPort.Parity

› Default:

SerialPort.NoParity

› Signal:

parityChanged()

› Attributes:

Writable

portName

This property holds the name of the serial port used for communicating with the Modbus RTU master.

› Type:

String

› Signal:

portNameChanged()

› Attributes:

Writable

stopBits

This property holds the number of stop bits of the serial port used for communicating with the Modbus RTU master.

› Type:

SerialPort.StopBits

› Default:

SerialPort.OneStop

› Signal:

stopBitsChanged()

› Attributes:

Writable

Example

import InCore.Foundation 2.5
import InCore.Modbus 2.5
import InCore.IO 2.5

Application {

    name: "Modbus RTU slave example"

    System {
        id: system
        Polling on cpuLoad { }
        Polling on deviceHumidity { }
        Polling on deviceTemperature { }
    }

    LED {
        index: LED.StatusBlue
        value: ledReg.data
    }

    ModbusRtuSlave {
        id: slave
        address: 1
        portName: "ttyO1"
        baudRate: SerialPort.Baud250000

        // expose CPU load as float (address 0+1)
        ModbusRegister {
            type: ModbusRegister.Input
            address: 0
            dataType: ModbusRegister.Float
            count: 2
            data: system.cpuLoad
        }

        // expose device temperature and humidity at address 2+3
        ModbusRegister {
            type: ModbusRegister.Input
            address: 2
            count: 2
            data: [ system.deviceTemperature, system.deviceHumidity ]
        }

        // control blue status LED through coil 0
        ModbusRegister {
            id: ledReg
            type: ModbusRegister.Coil
            address: 0
        }
    }
}