Serialport node does not work

[Atari]

Hi Everyone,
I am a beginner at raspberry Pi and Node Red.
A year ago I was able to get a raspberry pi with Node red working to control my television over rs232 commands. I useds the serialport node for this and a usb serial device. I remember having a hard time configuring this. It had something to do with permissions to use the serial port. But it did work, until the sd card crashed.

Now I am trying to repeat the experiment. I would like to catch the IR commands from my Loewe television to be sent to my bose surround set, which also has serial data in/out.

I installed the latest version of bullseye(11) with the latest version of Node Red(v3.0.2) with the latest version of serialport(1.0.1).

I made a simple config and the nodes connect to the ttyUSB0, but when I try to send, nothing is coming out of the port and after a while the request node times out with the notification "undefined".

any ideas how to get this working?

[dceejay]

You don’t need both serial nodes. Pick one or the other depending if you are expecting a reply or not. Also check what the end of line character needs to be for your TV. The default is \n but a lot of devices expect \r.

[Atari]

Thank you dceejay. I know I don't need to use them at the same time. This was just to show the state. I recovered the old configuration and this one works fine. I just can't remember how to handle the permissions.