First of all, sorry if this is a dumb question, but I'm pretty new to the whole Serial RS232 concepts.

I do have an Arduino Board that, from what I read about, is not able to communicate via RS232 because of different levels.

My question now is: If the Joy-IT RS232 Shield will make up for that. So is this shield handling the RS232 level shift? I don't really know what to look for so I am asking here.


1 Answer 1


Yes, that shield will handle the level shifting for you. If you look closely at the images of the shield, you see the MAX232 chip, which is a commonly used chip for getting UART (which is the Serial interface of the Arduino) to speak over RS232.

And yes, RS232 uses different voltage levels. The UART on a microcontroller usually uses the voltages 0V and 5V (or 3.3V depending on it's supply voltage), which is also called TTL levels (Transistor-Transistor Logic), while RS232 mostly works with +-10V (though different voltages are also inside the standard). You see, that this is a symmetrical voltage around ground (0V).

  • Wow thanks for the detailed answer! Then this shield is exactly what I need for my project.
    – Strohhut
    Nov 13, 2020 at 18:35

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.