TTL to RS485 Converter Module (3.3V / 5V Auto Direction) The TTL to RS485 Converter Module is designed to convert standard UART TTL signals into RS485 differential signals for long-distance and noise-resistant communication. It supports both 3.3V and 5V microcontroller logic levels, making it compatible with popular development boards such as ESP32, Arduino, STM32, Raspberry Pi, and other embedded platforms. Unlike traditional RS485 modules that require manual control of the transmit and receive direction using software, this module features automatic hardware direction control, simplifying firmware development and ensuring reliable communication. RS485 communication is widely used in industrial automation systems, Modbus RTU networks, building automation, HVAC monitoring, environmental monitoring systems, and long-distance sensor networks because of its excellent noise immunity and long cable distance support. This converter module allows microcontrollers to communicate with multiple RS485 slave devices on a shared bus, making it ideal for applications such as industrial monitoring, IoT gateways, PLC communication, SCADA systems, and distributed sensor networks. Key Features • Converts UART TTL signals to RS485 differential signals• Supports 3.3V and 5V logic level devices• Automatic transmit/receive direction control• Supports multi-drop RS485 communication• High noise immunity and stable data transmission• Compact design suitable for embedded systems• Screw terminal for secure RS485 wiring• Compatible with ESP32, Arduino, STM32, Raspberry Pi Applications • Industrial automation systems• Modbus RTU communication networks• SCADA monitoring systems• IoT gateways and sensor networks• PLC communication interfaces• Environmental monitoring systems• Long distance UART communication Specifications Parameter Value Communication Interface UART TTL to RS485 Logic Voltage 3.3V / 5V Control Automatic Direction Control Communication Standard RS485 Connector Screw Terminal Operating Temperature -40°C to 85°C Compatibility Arduino, ESP32, STM32, Raspberry Pi Pin Description Pin Description VCC Power Supply (3.3V / 5V) GND Ground TXD UART Transmit RXD UART Receive A RS485 Data A B RS485 Data B Package Includes 1 × TTL to RS485 Converter Module
