Issue with npk sensor

Good morning dears,
I follow the tutorial on this <site.
however, I feel like I have a problem with my sensor. It keeps displaying "255".
I've read all the articles that might be relevant to my problem, but I can't find the problem.

I use all the equipment as shown in the : picture. My sensor is power 5-30V and output : RS485.

thank you !

the script is the same as : " Sensor Node/Transmitter Code"

Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project :wink: See About the Installation & Troubleshooting category.

Note:
Most of us will highly appreciate it if you post your code (using so-called code tags) as well as a wiring diagram and the picture in your topic so we don't have to go to another site.

Hi you can close it! I found the issue ! thank you

Topics are not really closed. You have marked it as solved with the "solution" button.

What was the solution? Can you post it here so others that encounter the same problem can try it if needed.

change into

 void setup()
{
Serial.begin(9600);
mod.begin(4800);

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