RS232 vs. UART – What’s the difference? - Arduino https://forum.etechnophiles.com/arduino/rs232-vs-uart-whats-the-difference/ Hi, Welcome to the eTechnophiles forum. Got a question like, \'What resistor value to choose for your simple LED project\' OR \'Where is the resistor connected to the inbuilt LED in Arduino UNO\'s schematic\' - All will be answered here. Feel free to check out the topics below. en-US Sun, 12 Apr 2026 15:21:06 +0000 wpForo 60 Answer to: RS232 vs. UART – What’s the difference? https://forum.etechnophiles.com/arduino/rs232-vs-uart-whats-the-difference/#post-399 Tue, 18 Mar 2025 04:56:41 +0000 The following points highlight the major differences between UART and RS-232:

  1. UART (Universal Asynchronous Receiver-Transmitter) is a hardware module responsible for serial communication, whereas RS-232 is a communication standard that defines voltage levels and signaling for serial data exchange.

  2. UART operates at TTL logic levels, typically 0V for LOW and 3.3V or 5V for HIGH, while RS-232 uses higher voltage levels, ranging from ±3V to ±15V.

  3. UART manages data framing with start and stop bits, whereas RS-232 does not define framing but specifies the physical layer, including connectors and wiring.

  4. Since RS-232 operates at different voltage levels, a level shifter like MAX232 is required to interface RS-232 signals with UART-based TTL logic devices.

]]> Arduino Rashid https://forum.etechnophiles.com/arduino/rs232-vs-uart-whats-the-difference/#post-399 RS232 vs. UART – What’s the difference? https://forum.etechnophiles.com/arduino/rs232-vs-uart-whats-the-difference/#post-398 Mon, 17 Mar 2025 07:04:04 +0000 I know a little about RS232 and UART, and I understand that both are serial communication protocols. However, I’d like to understand them more broadly. Can anyone explain their key differences in terms of functionality and applications?

]]> Arduino Alfred Alonso https://forum.etechnophiles.com/arduino/rs232-vs-uart-whats-the-difference/#post-398