The MAX485 TTL to RS485 Module is a compact and efficient serial communication converter designed to interface TTL-level UART signals with RS485 differential communication lines. Based on the MAX485 transceiver IC, it enables long-distance, noise-immune data transmission, making it ideal for industrial automation, building control, sensor networks, and multi-drop communication systems.
Core Module Specifications
• Converter Type: TTL ↔ RS485 serial transceiver
• Driver IC: MAX485
• Communication Mode: Half-duplex RS485
• Signal Direction: Bidirectional
Electrical & Interface
• Operating Voltage: 5 V DC
• Logic Level: TTL (5 V)
• TTL Pins: RO, DI, DE, RE
• RS485 Pins: A, B
• Enable Control: DE and RE pins for transmit/receive control
• Baud Rate Support: Up to 2.5 Mbps (short distance)
Performance Characteristics
• Long-distance communication up to ~1200 m
• High noise immunity using differential signaling
• Supports multi-drop RS485 networks
• Stable operation in industrial environments
Physical Characteristics
• Module Type: PCB-mounted RS485 converter
• Terminal Type: Screw terminals for A/B lines
• Compact and lightweight design
• Clearly labeled pins for easy wiring
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• STM32, AVR, PIC microcontrollers
• PLC and industrial controllers
Key Advantages
• Reliable long-distance serial communication
• Simple TTL UART interface
• Ideal for noisy electrical environments
• Low power consumption
Technical Insights
• RS485 supports multiple devices on the same bus
• Termination resistors improve signal integrity on long lines
• DE and RE pins control data direction
• Requires half-duplex communication handling in software
Applications
• Industrial automation and control systems
• Modbus RTU communication
• Sensor and actuator networks
• Building management systems
• Long-distance serial data links
Pro Tip
• Use twisted-pair cable for A/B lines
• Add 120 Ω termination at both ends of long buses
• Control DE/RE pins carefully to avoid data collisions
• Match baud rate across all RS485 devices
Package Includes
• 1 × MAX485 TTL to RS485 Converter Module