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Installation

This tool was developed and tested on POSIX based operating systems, it should work also on Windows but this is not tested yet. All descriptions below are therefore for POSIX based systems.

Install node.js

If you don't already have a recent version of node.js (check on the command line by typing node --version) installed (all versions higher than 6.0 should work), you have to install node.js first. I recommend using n which allows easy upgrading. See the instructions on the GitHub Page. In short:

git clone https://github.com/tj/n.git
cd n
make install
n lts

Download the most recent version of modbus-client

Two ways to do:

  • Download the latest release from the release page, which is the recommended way to do in most cases
  • Clone the repository and get all updates on the master branch (which might be a bit risky...)

Install the dependencies

Enter into the directory where you copied the modbus-client sources to.

Either run npm i or, if you have installed yarn, yarn install. This will fetch the required sources from the NPM repository and take a little time.

Test the installation

As you don't have a valid configuration right now, we can only test the basics.

Enter the modbus-client directory, start the server with node server.js. A bunch of log messages, some of them errors (ECONNREFUSED) will appear. Open the URL http://localhost:8080 in your browser, you should see a website with one demo entry (but no values, as we can't connect to this not existing device).

If port 8080 is already occupied, see configuration how to change the port.