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    5.14.0 • Public • Published

    Platform Node-RED Contribution Modbus Financial Contributors on Open Collective NPM version ES_Sourdce_Version ES_Deploy_Version NodeJS_Version Standard - JavaScript Style Guide NPM download Build Status Codacy Badge Gitpod Ready-to-Code


    The all in one Modbus TCP and Serial contribution package for Node-RED.


    Node-RED contribution package for Modbus

    Based on modbus-serial with TCP, C701, Telnet, Serial, RTU buffered, and ASCII

    • stress tested with Node-RED v1.0.4 and Node.js LTS
    • works with queueing per unit and round robin scheduling

    Node-RED v1.x versions:

    • Node.JS 14.x is supported with v5.14.+
    • Node.JS 12.x is supported with v5.x
    • Node.JS 10.x is supported with v5.x

    Node-RED v0.x versions:

    • Node.JS 10.x is supported with v4.x
    • Node.JS 8.x is supported with v3.x
    • Node.JS 6.x is supported with v2.x
    • Node.JS 4.x is supported with v1.x

    If you like that contributor's package for Modbus, then please give us your star at GitHub !


    Run the following command in the root directory of your Node-RED install

    npm install node-red-contrib-modbus

    Run the following command for global install

    npm install -g node-red-contrib-modbus

    try these options on npm install to build, if you have problems to install

    --unsafe-perm --build-from-source

    modbus-serial, serialport and jsmodbus

    The serialport optional dependency is just to list all ports on your system in the client configuration. It is not the serialport version to work with Modbus at runtime. For that check the modbus-serial or jsmodbus package.json, please! The modbus-serial supports and works for TCP connections in that package, too. The jsmodbus package is just to provide a simple Modbus Server node. All Modbus commands running on modbus-serial.

    TCP or Serial testing

    If you get in trouble with TCP connections, then check and test with just modbus-serial first, please!

    If you get in trouble with Serial connections, then check with just serialport first, please!


    To update the dependencies or the whole package, you have just to install again.

    npm show node-red-contrib-modbus@* version

    To get a special version please set the version with @M.M.F:

    npm install node-red-contrib-modbus@3.6.1

    or global by

    npm install -g node-red-contrib-modbus@3.6.1

    How to use

    Flow Example


    Debug will be activated by starting Node-RED with debug mode:

    DEBUG=contribModbus*,modbus-serial node-red -v

    see Wiki pages to get more options in detail


    Let's work together! Contributors are welcome. Please, for the repo and send your pull requests from your repo to our develop branch or open issues while you're testing!

    For Developers

    See the scripts of the package and the additional Shell scripts to clean, update, or upgrade this NPM package.

    • dev-link (local testing with Node-RED)
    • testing (unit, integration)
    • coverage
    • docs generation
    • standard-version alpha, beta, release
    • git-flow

    For Testers

    Report issues, share your experiences, record tutorials, write Wiki articles and Blogs to share more about this package, please!


    since April 2016 by Klaus Landsdorf and Community Driven



    Code Contributors

    This project exists thanks to all the people who contribute. [Contribute].

    Financial Contributors

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    npm i node-red-contrib-modbus

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