In this tutorial I will explain how to integrate Node-RED via Modbus in a SCADA system, and how read and write values using simple HTTP requests.
For this test I am using the SCADA in a PC and Node-Red installed in a Raspberry Pi. I am using also a Modbus/MQTT board to get data of temperature and so on. You can replace it for creating a virtual dataset and virtual datapoints in ScadaBR.
Both ScadaBR and Node-RED JSON config files could be get here.
| item | version | description |
|---|---|---|
| ScadaBR | 1.2 | Supervisory Control and Data Acquisition |
| Node-RED | 2.0.6 | Programming Tool for API, Software and Hardware |
| node-red-contrib-modbus | 5.14.1 | Module to support Modbus inside Node-RED |
| NodeJS | 14.17.6 | Javascript for backend |
The ScadaBR will be two datapoints, one for Node-RED and another one to JE03 board, I've created some point links that I will explain later.
Setup for Node-RED