MAX202 RS232 to TTL Converter For Arduino

The MAX202 RS232 to TTL Converter enables bidirectional communication between TTL-level serial microcontrollers and standard RS-232 devices. It is an ideal interface module for makers, students, and engineers working on embedded projects, legacy hardware integration, and device programming.

Bidirectional serial level shifting

Powered by a MAX202-based level shifter, this pre-assembled board converts standard 5V TTL logic serial signals to RS-232 levels and vice versa. It facilitates stable serial communication between modern development boards and RS-232 industrial or computer equipment.

Standard DB9 and header pinout

The module features an integrated female DB9 connector for RS-232 signals alongside a standard 4-pin TTL header. The 4-pin interface breaks out ground, +5V power, logic out (STX), and logic in (SRX) for straightforward wiring.

Extensive microcontroller support

Designed for direct connection to Arduino hardware serial pins 0 and 1, the converter also supports a wide range of other microcontrollers. It is suitable for programming and communicating with STC, NXP, Renesas, STM32, and N+-2EC MCUs.

Flexible baud rate capabilities

The board operates across communication speeds ranging from 300 to 115200 baud. Transmission distance depends on speed and environment, achieving typical ranges of up to 50 feet at 19200 baud, 500 feet at 9600 baud, and 1000 feet at 4800 baud.

Firmware flashing and diagnostic utility

This converter is well suited for flashing set-top boxes, hard drives, DVDs, radios, phones, and gaming consoles. It also serves as a dependable serial interface for GPS units and vehicle detection systems.

Included in the package

Each unit ships as a fully pre-assembled RS232-to-TTL converter board ready for immediate integration into your project.

Downloads & documentation

• schematics
• datasheet