Option 2 – Modbus Serial Slave, the communication channel is also an integrated serial port.

Option 1 – Modbus Serial Master, where the communication channel is the built-in serial port of the controller.

In the figure 3 are shown examples of configurations when configuring various Modbus modes: When configuring various modes, Modbus devices are connected to the corresponding serial port or directly to the controller. For example, Modbus devices are virtual and are designed to configure the parameters of the IEC library that is automatically loaded into the project when a specific device is connected. In the device tree you need to connect (depending on the situation) not only devices that correspond to real-life modules, but also virtual devices that do not have a hardware equivalent. The selected device will appear in the project in the device tree. Control relay.Select the desired device, click the Add device button or double-click the left mouse button. Control relay.ch1 to 'on' and delay 1000 ms. Polling Modbus device's data const config = // Reference config definitionĬonst modbusPoll = new ModbusPoll(config) Ĭonsole.log('Receive polling data:', data)

actuators.address: The Modbus register address.

actuators.functionCode:: The Modbus function code.

actuators.slaveId: The Modbus device's slave ID.

actuators.property: Define data property name.

actuators.thingName: Define device name.

actuators: Array of Modbus address table for control.

Ex: decimal is 2, data is 2635, result is 26.35.

cimal?: When data is a numberic, decimal will convert decimal places.

sensors.endian?: The payload's endial, little or big or raw, Default is raw.

sensors.address: The Modbus register address.

sensors.functionCode:: The Modbus function code.

sensors.slaveId: The Modbus device's slave ID.

sensors.property: Define data property name.

sensors.thingName: Define device name.

sensors: Array of Modbus address table for read.

delay: Set read/write command's delay time.timeout: Set Modbus command's timeout.interval: Set the polling interval, Default is 3000ms.serialPorptions.baudRate: The serial port's baud rate.serialPorptions: The ModbusRTU options.port: e ModbusTCP port, default is 502.path: e ModbusRTU serial port path, ex: /dev/ttyUSB0.type```: dbus client type, support ModbusTCP, ModbusRTU, ModbusRTUBuffered`.For best results you should stick to LTS versions, which are denoted by even major version numbers e.g. This module has not been tested on every single version of NodeJS. NPM npm install yarn add these options on npm install to build, if you have problems to install -unsafe-perm -build-from-source This package is used modbus-serial package to connect Modbus protocol and operate Modbus commands. Modbus Poll can automation polling the Modbus devices by Modbus map table and convert to JSON object by defined property.

Modbus poll interval