The RS232 to TTL Serial Interface Module is a reliable communication converter designed to translate RS232 voltage-level signals into TTL-level serial signals and vice versa. It enables seamless communication between computers, industrial equipment, and microcontrollers such as Arduino, ESP32, and Raspberry Pi. Commonly based on the MAX232 IC (or equivalent), this module is ideal for legacy device interfacing, industrial automation, and embedded serial communication projects.
Core Module Specifications
• Converter Type: RS232 ↔ TTL serial level converter
• Conversion IC: MAX232 / compatible
• Communication Type: Asynchronous serial (UART)
• Signal Direction: Bidirectional
Electrical & Interface
• Operating Voltage: 3.3 V – 5 V (module dependent)
• RS232 Side: DB9 or header pins (TXD, RXD, GND)
• TTL Side: TX, RX, GND
• Baud Rate Support: Up to 115200 bps (typical)
• Onboard Components: Charge pump capacitors
Performance Characteristics
• Stable and noise-resistant serial communication
• Supports long cable lengths on RS232 side
• Reliable data transfer with legacy equipment
• Suitable for continuous operation
Physical Characteristics
• Module Type: PCB-mounted serial converter
• Connectors: Pin headers / DB9 (variant dependent)
• Compact and lightweight form factor
• Easy integration into embedded systems
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• STM32, AVR, PIC microcontrollers
• Raspberry Pi
• Industrial RS232 devices and PCs
Key Advantages
• Enables interfacing with legacy RS232 devices
• Simple plug-and-play serial conversion
• Wide MCU compatibility
• Cost-effective communication solution
Technical Insights
• RS232 uses ± voltage levels, TTL uses 0–VCC logic
• MAX232 uses internal charge pumps for voltage conversion
• TX/RX lines must be crossed correctly
• Not compatible with RS485 without additional hardware
Applications
• Industrial automation systems
• CNC and machine controllers
• Serial device debugging
• Embedded system communication
• Legacy equipment interfacing
Pro Tip
• Always confirm module operating voltage before powering
• Cross TX and RX correctly between devices
• Use proper grounding to avoid communication errors
• Match baud rate on both communicating devices
Package Includes
• 1 × RS232 to TTL Serial Interface Module