# Node-red-contrib-melsec Configuration
**URL:** https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626
**Category:** General
**Created:** [10 November 2025 03:58 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626 "2025-11-10T03:58:49Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Dar](https://discourse.nodered.org/u/Dar)
#### Post date: [10 November 2025 03:58 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626/1 "2025-11-10T03:58:49Z")
Hello everyone,
I am trying to connect a Mitsubishi FX3G-60M PLC to my Raspberry Pi using Node-RED. My goal is just to read some data to display on my dashboard.
I'm using the `node-red-contrib-melsec-fx` nodes and am having trouble configuring the serial port (e.g., `/dev/ttyACM0`).
I thought the serial port settings would be inside the `melsec-fx-in` node, but I can't find them. The node only asks me to select a "Melsec FX endpoint," as you can see in this screenshot:
I guess the serial port configuration must be inside that "Melsec FX endpoint" node, but I don't know how to access or edit it.
Could someone please point me in the right direction?
Thank you!
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [10 November 2025 07:52 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626/2 "2025-11-10T07:52:21Z")
Hi, welcome to the forum
> [@Dar](#):
>
> I guess the serial port configuration must be inside that "Melsec FX endpoint" node, but I don't know how to access or edit it.
Have you tried clicking the pencil button to the right of "Melsec FX endpoint"?
* * *
As you are a new user, I recommend watching this playlist: [Node-RED Essentials](https://www.youtube.com/playlist?list=PLyNBB9VCLmo1hyO-4fIZ08gqFcXBkHy-6). The videos are done by the developers of node-red. They're nice & short and to the point. You will understand a whole lot more in about 1 hour. A small investment for a lot of gain.
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### Author:  [@Dar](https://discourse.nodered.org/u/Dar)
#### Post date: [10 November 2025 08:40 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626/3 "2025-11-10T08:40:34Z")
> [@Steve-Mcl](#):
>
> Have you tried clicking the pencil button to the right of "Melsec FX endpoint"?
Hi @Steve-Mcl,
I clicked the pencil icon as you suggested:
That opened the endpoint configuration node, which shows these options:
I am trying to retrieve data from the Mitsubishi PLC using its programming port, not the Ethernet port, which is why I was looking for the serial settings.
> [@Steve-Mcl](#):
>
> I recommend watching this playlist: [Node-RED Essentials](https://www.youtube.com/playlist?list=PLyNBB9VCLmo1hyO-4fIZ08gqFcXBkHy-6).
My confusion came from the fact that I have some experience retrieving data from Siemens PLCs using Node-RED, and those nodes handle the connection settings differently."
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [10 November 2025 08:53 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626/4 "2025-11-10T08:53:14Z")
Yeah, I have not used that node and seen you were a new user and (wrongly) assumed you were also new to Node-RED (they are still worth a watch if you've not seem them - a few good tips and tricks in there)
So, i am surprised there is no serial settings on that config node also!?
However, a clue lies in the nodes source code: [node-red-contrib-melsec/red/melsec.js at abdf6d71013873bf44908f79cf3ec175f2e78065 · st-one-io/node-red-contrib-melsec · GitHub](https://github.com/st-one-io/node-red-contrib-melsec/blob/abdf6d71013873bf44908f79cf3ec175f2e78065/red/melsec.js#L187)
> ```js
> if (!melsecAdapter) return that.error('Missing "@protocols/node-melsec" dependency, avaliable only on the ST-One hardware. Please contact us at "st-one.io" for pricing and more information.')
>
> ```
I.e. it looks like this requires ST-One hardware (and I guess thats where the setup is done)
* * *
If you are familiar with JavaScript, you could DIY this in a function node using [node-fxplc](https://www.npmjs.com/package/node-fxplc) node module. The readme has example code on how to connect serial and read/write addresses
See article [Use any npm module in Node-RED](https://flowfuse.com/blog/2023/06/import-modules/) for getting started with npm node modules.
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### Author:  [@Dar](https://discourse.nodered.org/u/Dar)
#### Post date: [10 November 2025 13:23 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626/5 "2025-11-10T13:23:23Z")
Thank you very much for your help 🙏 much appreciated
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [10 November 2025 13:44 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626/6 "2025-11-10T13:44:36Z")
In the interest of sharing, if you have developed a working example, it would be good to post that on the forum for future readers. Perhaps in this thread or linked to a post in #Share Your Projects would be great.
Ta. Steve.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [24 November 2025 13:45 UTC](https://discourse.nodered.org/t/node-red-contrib-melsec-configuration/99626/7 "2025-11-24T13:45:32Z")
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