Modbus Node-Red Dashboards and MQTT Modbus Bridge

As part of my work with modbus I’ve created several tools that make testing node-red modbus flows easier. In particular I’ve created two dashboards . These dashboards are identical in appearance and they let you send modbus read and write commands form the browser. However the first dashboard interfaces directly with the modbus getter and write nodes whereas the second sends the commands via MQTT to¬† remote getter and setter nodes .

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Writing Modbus Data with node-red

In the previous tutorial we looked at the modbus nodes and looked at how to read data from a Modbus server using node-red. In this tutorial we will look at writing data to a modus server using node-red.

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How to Use Node-Red with Modbus

Modbus is a de facto standard, truly open and the most widely used network protocol in the industrial manufacturing environment.-ref Modbus Faqs Because of its popularity there is a growing requirement for reading data and controlling Modbus devices over TCP/IP networks using node-red.

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My Modbus Working Notes

I have developed a few flows for third parties that have mainly involved decoding Modbus data. However I have never used Modbus in a live environment and needed to get familiar with the basics in order to develop and test these flows. Fortunately the people I worked with had a very good understanding of Modbus, but not of node-red, JavaScript and MQTT These are my working notes from my efforts to create these flows and in particular an MQTT to Modbus bridge. If you are new to Modbus you may find them useful.

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