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To delete all the old references to serial ports in the serial node, double click the serial node. Click the pencil to edit. Upper left of that window select delete.

Use pull down to select next serial device. Use pencil to edit. Delete. Repeat for any remaining serial cables.

Then it will prompt to create new. When you were in the /dev/serial folder, highlight the serial cable in the serial by ID folder. Right click and select copy path.

Back in Node Red when you open the serial node and create new. Paste the path you copied for the usb to serial adapter. Set baud rate. Set timeout to something like 500 ms. It defaults to 10000 ms. This is important!

Sorry if I am not 100% accurate with description. Doing it from memory while out having lunch.

Again let me know and I can help tomorrow.

Dave wo2x

Sent from my waxed string and tin cans.