node-red-contrib-modbus 3.6.1

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

npm install node-red-contrib-modbus

Node-RED Modbus Standard - JavaScript Style Guide ES_Sourdce_Version ES_Deploy_Version NodeJS_Version NPM download NPM version Build Status



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

Node-RED contribution package for Modbus

Become a backer of the project straight away!

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

  • stress tested with Node-RED v0.17.5 and Node.js v6.x and v8.x LTS
  • works with queueing per unit and round robin scheduling
  • Node.JS 4.x is supported with v1.x


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


To update the dependencies or the whole package, you have just to install again. To get a special version please set the version with @M.M.F:

npm install [email protected]

or global by

npm install -g [email protected]

How to use

see Wiki pages

use the Flow example to see how it works ...

see YouTube Playlist

Flow Example


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

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




  • core
    • core:client
  • read
  • write
  • server
  • response
  • flex
    • flex:getter
    • flex:write
    • flex:connector
    • flex:server
  • modbus-serial

see Wiki pages to get more options in detail


since April 2016 by Klaus Landsdorf


Node Info

Version: 3.6.1
Updated 1 week, 6 days ago
License: BSD-3-Clause
Rating: 5.0
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  • modbus-client
  • modbus-response
  • modbus-read
  • modbus-getter
  • modbus-flex-getter
  • modbus-write
  • modbus-flex-write
  • modbus-server
  • modbus-flex-server
  • modbus-queue-info
  • modbus-flex-connector
  • modbus-io-config
  • modbus-response-filter


  • node-red
  • modbus
  • fieldbus
  • automation
  • iiot
  • biancode
  • opcua


  • biancode