Serial input node stops reading data

Sorry. I didn't understand. If you mean whether there is anything else coming on the serial node when it stops, then it is nothing.

No, I want to see the output in the terminal when you start node-red. The output that starts something like this

Welcome to Node-RED
===================
25 Oct 15:21:21 - [info] Node-RED version: v3.0.2
25 Oct 15:21:21 - [info] Node.js  version: v16.18.0
25 Oct 15:21:21 - [info] Linux 5.4.0-131-generic x64 LE
25 Oct 15:21:21 - [info] Loading palette nodes
...

However, I have just notice that you are using an old version of node-red (2.0.5) and an out of support version of node.js (12.16.2). I suggest you make sure first make sure all your installed nodes are up to date (in Manage Palette), then update node.js to v16 or v18 and then node-red to the latest (3.0.2).
If is then still doesn't work post the log above.

Got you. Will update everything first. Then will run the NodeRED and let you know. Thanks

After you update node.js you will need to go into your .node-red directory and run
npm rebuild
to rebuild all the installed nodes for the new nodejs version.

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