RS232 to TTL Serial Interface Module 4 Pin

RS232 to TTL Serial Interface Module 4 Pin 

The RS232 to TTL Serial Interface Module (4-pin) is a compact communication converter designed to interface devices using RS232 voltage levels with microcontrollers that operate on TTL logic levels (3.3V/5V).
It typically uses an RS232 transceiver IC such as MAX3232 / MAX232, which converts the high-voltage ±12V RS232 signals into safe TTL-level signals for Arduino, ESP32, STM32, Raspberry Pi, PIC, and AVR microcontrollers.
This module is essential for connecting legacy RS232 devices like modems, GPS receivers, industrial controllers, and barcode scanners to modern TTL-based electronics.

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Features

• Converts RS232 voltage levels (±12V) to TTL levels (0–5V or 0–3.3V)
• Based on MAX3232/MAX232 level-shifting IC
• 4-pin TTL header: VCC, GND, TX, RX
• Integrated charge pump for true RS232 voltage generation
• Supports baud rates up to 115200 bps or higher
• Works with 3.3V and 5V logic (depending on module version)
• Compact and easy to integrate into embedded projects
• Provides reliable bi-directional serial communication
• Compatible with a wide range of microcontrollers

Applications 

• Connecting RS232 devices to Arduino / ESP32 / STM32
• Interface with old computers, modems, or industrial controllers
• Serial communication with GPS, GSM, and barcode readers
• Data logging from RS232 instrumentation
• Upgrading legacy equipment to TTL/USB communication
• Home automation systems needing RS232 integration
• Robotics and IoT projects requiring long-distance serial signals
• Diagnostic and debugging communication for embedded systems