Question about the serial node

General
1

I am using the serial node to communicate over RS232 and I am getting additional characters in my string response. Would anyone have an idea of what these characters are and how to remove them?

sample:
22.03

Screenshot 2025-07-28 182936
Screenshot 2025-07-28 182936269Ă—998 12.1 KB

2

Question:
What baud rate?

What structure is/are the messages?
WHO is sending them? (Arduino, some other device)

Just thoughts....

Stop bits wrong.

Parity wrong.

Have you tested the RS232 link with another device?

3

they will be either linefeed/carriage returns or control characters like STX, ETX etc.

Change the output to a buffer and you will be able to see the character code byte values.

2 Likes
4

Looks like it is XON, XOFF and Line feed. Any idea on the best way to remove?

5 
const asciiPayload = msg.payload.replace(/[\x00-\x1F\x7F-\x9F]/g, '').replace(/[^\x20-\x7E]/g, '');
msg.payload = asciiPayload;
return msg;

try that in a function node.. or you could do a regular expression in a change node

This was from an old project so no warranty on code :slight_smile: