MAX3232 RS232 to TTL Serial Port Converter Module

MAX3232 RS232 to TTL Serial Port Converter Module is a compact, reliable level shifter module used to interface RS232 serial devices with microcontrollers operating at TTL voltage levels (3.3V or 5V). It is based on the MAX3232 IC, which supports low-voltage operation while maintaining full-duplex RS232 communication. This module is ideal for connecting microcontrollers, Arduino boards, Raspberry Pi, or other TTL logic devices with legacy RS232 serial ports.

Key Features:

• MAX3232 Chipset: Ensures reliable RS232 to TTL signal conversion at low voltages.
• Wide Voltage Range: Operates with both 3.3V and 5V logic levels.
• Compact Design: Small PCB footprint with onboard DB9 female connector.
• Full Duplex Communication: Supports simultaneous TX and RX for stable two-way data flow.
• Plug-and-Play Interface: Easy to connect with UART-compatible microcontroller pins.

Technical Specifications:

• IC Used: MAX3232
• Voltage Input: 3.3V to 5V
• Communication Standard: RS232 to TTL (logic-level)
• Serial Interface: DB9 female (RS232 side), 4-pin header (TTL side)
• Signal Lines: TX, RX, VCC, GND
• Data Rate: Up to 250 kbps
• Operating Temperature: -40°C to +85°C

Mechanical Specifications:

• PCB Dimensions: Approx. 33mm × 32mm
• Connector Type: DB9 Female + 4-pin male header
• Mounting: 2x M3 mounting holes for secure attachment
• PCB Material: FR4 with blue solder mask

Pinout and Wiring:

• VCC: Connect to 3.3V or 5V (depending on MCU logic)
• GND: Connect to system ground
• TXD: Transmit from MCU to RS232 device
• RXD: Receive from RS232 device to MCU
• RS232 Side: Connects to serial port of PC or industrial controller

Datasheet and Documentation:

• Download MAX3232 Datasheet (PDF)

Applications:

• Microcontroller Communication: Bridges RS232-based sensors with TTL-level MCUs.
• Legacy Device Integration: Connects Arduino or ESP8266 to legacy RS232 instruments.
• PC Serial Interface: Interfaces microcontroller data with serial COM port.
• Industrial Equipment: Used in PLC, SCADA, and CNC data logging systems.

Equivalent Models:

• SP3232: Pin-compatible RS232 transceiver
• ICL3232: Low-power alternative with similar features
• ADM3202: High-speed equivalent with wide supply range

Package Includes:

• 1 x MAX3232 RS232 to TTL Serial Port Converter Module