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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Local Installs and Managing Node-Red Projects

The default install installs node-red globally using the -g switch and is the most common installation method. However if you are working on multiple projects and you need to keep them separate then there are a number of things you can do:

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Using the UI Dashboard Template Node (Widget)

The Dashboard UI template node is used for mainly used for displaying data but it can also be used for data input. The template widget can contain any valid html and Angular/Angular-Material directives. If you aren’t familiar with angular then take a look at the w3 schools tutorial.

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Node-Red Message and Object Cloning

As previously discussed in the the understanding the message object tutorial messages are passed between nodes using a message object. And as also discussed that this object is a standard JavaScript object and In JavaScript objects are passed by reference and not by value.

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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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Using the Node-Red Template Node

There are two template nodes in node-red. They are the HTML template node and the dashboard template node. In this tutorial we will discuss the HTML template node which is a core node, and is located in the function section.

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Node-Red Initialising Flow Data on Startup

Often you want your flow to start with known conditions. For example you may have a flow that records various sensors, and have alarms set when the sensors exceed a given value. As an example you may want to trigger an alarm when the temperature falls below 3 degrees or exceeds 30 degrees Centigrade.

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Node-Red Settings.js File – Node-Red Admin

Node red uses a settings file called settings.js located in in the user .node-red (dot node-red) folder in their home directory. You can create your own settings file and customise it either by copying the existing file or using the file available from Github here. On Linux the settings.js file is copied from the /usr/lib/node-modules/node-red/ folder to your .node-red folder in your home directory when you start node-red, and there is no settings.js file present.

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