TTL to RS485 Serial Converter Module – 3.3V / 5V Auto Control Board

The REES52 TTL to RS485 Adapter Module (XY-485) is a high-performance serial communication converter designed to seamlessly convert TTL (UART) signals into RS485 signals and vice versa. With automatic flow control, this module eliminates the need for manual transmit/receive switching, making it as easy to use as a standard serial port.

Supporting a wide operating voltage range of 3V to 30V, the module is fully compatible with 3.3V and 5V TTL systems, making it ideal for Arduino, ESP8266, ESP32, Raspberry Pi, PLCs, and industrial controllers.

Built for long-distance and industrial communication, the module supports transmission distances up to 800 meters (tested up to 850m) and includes lightning protection, strong anti-interference design, and high EMC/EMI performance. The onboard TXD and RXD indicator LEDs provide real-time visual feedback for easy monitoring and debugging.

With features like 120Ω termination resistance, hot-swap support, multi-device bus communication, and industrial-grade components, this TTL to RS485 converter is perfect for automation systems, sensor networks, and embedded projects.

⭐ Key Features

• Automatic TTL ↔ RS485 signal conversion

• Wide operating voltage: DC 3V – 30V

• Compatible with 3.3V & 5V signals and power

• TXD & RXD LED indicators for data monitoring

• Long-distance communication up to 800 meters

• Built-in lightning protection & anti-interference

• High EMC & EMI performance

• Supports multi-device RS485 bus (up to 128 devices)

• Hot-swappable design

• 120Ω matching resistance for long-distance transmission

• Standard 2.54mm pin spacing for easy integration

📊 Specifications