DFRobot MAX202 RS232 to TTL Converter Module
DFRobot MAX202 RS232 to TTL Converter Module - Image 2
DFRobot MAX202 RS232 to TTL Converter Module - Image 3
SKU: SENS-2964
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DFRobot MAX202 RS232 to TTL Converter Module

₹929.00 (Inclusive of all taxes)
Out of Stock

The DFRobot MAX202 RS232 to TTL Converter is a level-shifting module designed to interface TTL-level serial signals (0-5V) with standard RS232 serial ports. It is compatible with Arduino, Raspberry Pi, STM32, and other 5V/3.3V microcontrollers for industrial communication and device programming.

Features

  • MAX202-based RS232 to TTL bidirectional signal conversion.
  • Supports baud rates from 300 to 115,200 bps for flexible communication.
  • 4-pin header interface (GND, +5V, Logic Out (STX), Logic In (SRX)) for easy integration.
  • LED indicators for real-time TX and RX signal monitoring.
  • Widely used for MCU programming (STC, NXP Semiconductors, Renesas, STM32) and industrial device interfacing.

Out of stock

Description

The DFRobot MAX202 converter utilizes the industry-standard MAX202 IC to provide robust level translation between TTL logic (0-5V) and RS232 voltage levels (±3V to ±15V). This enables direct serial communication between modern microcontrollers and legacy industrial equipment, diagnostic tools, or programming hardware that require standard RS232 interfaces.

The module features a compact design with clear transmit and receive LEDs for debugging serial data flow. Its simple 4-pin connection (power, ground, serial transmit, serial receive) allows for straightforward integration into prototyping boards and embedded systems, eliminating the need for complex external circuitry.

Key Features

  • Built around the reliable MAX202 RS232 transceiver IC for stable signal conversion.
  • Bidirectional conversion: TTL to RS232 and RS232 to TTL.
  • Integrated LEDs provide visual confirmation of TX and RX data activity.
  • Compact PCB design with a standard 4-pin header for quick wiring.
  • Wide baud rate compatibility supports both slow and high-speed serial protocols.
  • Optimized performance-to-cost ratio for industrial and educational applications.

Applications

  • Programming and debugging STC, NXP Semiconductors, Renesas, and STM32 microcontrollers via serial bootloaders.
  • Interfacing Arduino, Raspberry Pi, or ESP32 projects with legacy RS232 industrial equipment (PLCs, CNC machines, scales).
  • Enabling serial communication for GPS modules, vehicle diagnostic tools, and radio modification hardware.
  • Integrating TTL-based sensors or modules into systems requiring standard RS232 communication protocols.

Technical Specifications

Item TypeAccessory / Communication Converter
Core ICMAX202
Interface4-pin header (GND, +5V, Logic Out (STX), Logic In (SRX))
ConversionRS232 to TTL (0-5V) bidirectional
Supported Baud Rate300 to 115,200 bps
Logic Voltage5V TTL
Indicator LEDsTX, RX
Typical ApplicationsMCU programming (STC, NXP Semiconductors, Renesas, STM32), industrial device communication, Arduino serial expansion

Frequently Asked Questions

What is the operating voltage for the TTL side of this MAX202 converter?

The TTL logic side of the converter operates at a standard 5V DC, which is supplied via the +5V pin on the 4-pin header. This makes it directly compatible with 5V microcontrollers like most Arduino boards. Ensure your power source provides a stable 5V supply to the module for correct level translation.

How do I connect this converter to an Arduino Uno for serial communication?

Connect the module's +5V and GND pins to the Arduino's 5V and GND. Connect the module's Logic In (SRX) pin to Arduino's TX (Digital Pin 1), and the module's Logic Out (STX) pin to Arduino's RX (Digital Pin 0). This setup allows the Arduino's TTL serial to be converted to RS232 levels output via the DB9 connector.

What baud rates are supported, and is any configuration needed?

The module supports a wide range of standard baud rates from 300 to 115,200 bits per second. No configuration or jumpers are required on the module itself. The baud rate is set entirely by the host microcontroller's serial library (e.g., Serial.begin(9600) in Arduino). Ensure the connected RS232 device is configured to match the same baud rate.

Can this converter be used with 3.3V logic microcontrollers like ESP32 or Raspberry Pi?

The MAX202 IC and this module are designed for 5V TTL logic. Direct connection to 3.3V logic devices is not recommended as the 5V TX signal from the module could damage the 3.3V microcontroller's input pin. For safe operation with 3.3V systems, use an additional logic level converter between the module's TTL pins and the microcontroller.

Package Includes

  • 1 x DFRobot MAX202 RS232 to TTL Converter Module

Additional Information

Weight 0.015 kg
Dimensions 9 × 7 × 3 cm

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