MAX232 RS232-TTL DB-9 Serial Port Converter Module

The MAX232 RS232-to-TTL Converter Module is a reliable and compact interface board designed to convert RS232 serial signals to TTL logic levels and vice versa. It enables seamless communication between microcontrollers (such as Arduino, PIC, AVR, ARM, and STM32) and RS232 devices like computers, industrial equipment, CNC machines, and legacy serial peripherals.

Powered by the industry-standard MAX232 IC, this module ensures stable signal conversion using built-in charge-pump circuitry, eliminating the need for dual power supplies. The onboard DB-9 connector allows direct connection to standard RS232 serial ports, making integration fast and hassle-free.

Key Features

• Converts RS232 (±12V) signals to TTL (0–5V) levels
• Based on the MAX232 integrated circuit
• Integrated DB-9 serial connector for direct PC connection
• Supports full-duplex communication (TX and RX)
• Onboard electrolytic capacitors for charge-pump voltage generation
• Compact design with clearly labeled TTL pins
• High noise immunity and stable data transmission

Specifications

• Chipset: MAX232
• Interface Type: RS232 ↔ TTL
• TTL Voltage Level: 5V
• RS232 Voltage Level: ±7V to ±12V
• Power Supply: 5V DC
• Communication Mode: Full duplex
• Connector: DB-9 female (RS232 side)
• Baud Rate Support: Up to 120 kbps (typical)
• Operating Temperature: −40°C to +85°C

Pin Description (TTL Side)

• VCC: +5V Power Input
• GND: Ground
• TXD: TTL Transmit
• RXD: TTL Receive

Applications

• Microcontroller serial communication
• Arduino and embedded system projects
• Industrial RS232 device interfacing
• CNC and PLC serial communication
• Debugging and programming via serial port
• Legacy equipment communication

Notes: Images are for illustration purposes only.