TTL to RS485 Converter Module 3.3V/5V Wide Voltage UART to RS485 Hardware Auto Direction Control Board

TTL to RS485 Converter Module for Stable Serial Communication

The TTL to RS485 Converter Module is designed to convert TTL UART serial signals into RS485 differential signals. It is useful for Arduino, ESP32, STM32, Raspberry Pi UART interface, PLC communication, industrial control systems, sensor networks, and long-distance serial communication projects.

This module supports a wide power supply range from 3.0V to 30V, so it can work easily with both 3.3V and 5V systems. Also, it supports automatic transmit and receive direction switching, which makes RS485 communication simple like using a normal serial port.

Wide Voltage and 3.3V/5V Compatibility

The board is designed to work with different voltage systems. It can match both 3.3V logic and 5V logic, making it suitable for many development boards and single-chip microcontroller applications.

Because of the wide input voltage range, it can be used in different project conditions without needing many extra voltage conversion circuits.

Hardware Auto Direction Control

This TTL to RS485 module supports automatic flow direction control. Therefore, the board can automatically switch between sending and receiving modes during communication.

This feature removes the need for manual DE/RE control pins in many applications. It also helps reduce wiring complexity and makes the module easier to use in UART-based projects.

Industrial Anti-Interference Design

The module includes an anti-interference layout and RS485 bus protection design. It is suitable for long-distance field communication where electrical noise may be present.

For outdoor or field wiring, the earth terminal can be connected to ground for better lightning protection and noise reduction. For short indoor connections, earth connection may not be required.

Suitable for Multi-Node RS485 Network

This converter board supports multi-machine communication. At least 40 nodes can be connected on the same RS485 network, depending on wiring quality, cable length, baud rate, and environment.

It also includes provision for 120-ohm matching resistance. Short-circuiting R0 enables the matching resistor. This is recommended for long-distance RS485 communication.

Key Features

• Converts TTL UART serial signal to RS485 signal
• Supports RS485 to TTL communication
• Wide power supply range: 3.0V to 30V
• Compatible with 3.3V and 5V signal systems
• Automatic transmit/receive direction control
• Simple UART-based operation
• Strong anti-interference and EMC/EMI design
• Lightning protection design for RS485 bus safety
• Supports long-distance serial communication
• Standard 2.54mm pin headers for easy development
• Screw terminal connector for direct wiring
• Supports multi-node RS485 communication
• 120-ohm matching resistor option for long cable use
• Suitable for Arduino, ESP32, STM32, Raspberry Pi, PLC, and sensor networks

Technical Specifications

Parameter	Details
Product Type	TTL to RS485 Converter Module
Signal Conversion	TTL UART to RS485 / RS485 to TTL
Power Supply Range	3.0V to 30V
Logic Compatibility	3.3V and 5V systems
Direction Control	Hardware automatic flow direction control
Communication Interface	UART / Serial Port
RS485 Network Support	Multi-node communication
Node Support	At least 40 nodes
Matching Resistor	120-ohm optional matching resistance
Pin Header Pitch	Standard 2.54mm
Wiring Type	Terminal block and pin header
Protection Design	Lightning protection and anti-interference design
Application Type	Industrial communication, embedded systems, automation projects

Applications

• Arduino RS485 communication projects
• ESP32 UART to RS485 communication
• STM32 and microcontroller serial communication
• Raspberry Pi serial communication interface
• Industrial control systems
• PLC communication
• Modbus RTU sensor networks
• Long-distance wired communication
• Smart meter communication
• Automation and monitoring systems
• Multi-node serial bus communication
• IoT and embedded hardware projects

Why Choose This TTL to RS485 Converter Module?

This module is useful when stable long-distance serial communication is required. RS485 is commonly used because it performs better than normal UART for longer cable distances and noisy environments.

Also, the automatic direction control makes this board easier to use. You do not need to manually control transmit and receive direction in most basic applications. Therefore, it is suitable for students, makers, technicians, and professional hardware developers.

Package Includes

• 1 x TTL to RS485 Power Supply Converter Board 3.3V 5V Hardware Auto Control Module

Important Product Disclaimer

Please verify the product specifications, wiring details, voltage rating, pinout, and application suitability from the actual product label, supplier datasheet, or manual before use. Product appearance, onboard chip marking, terminal colour, silkscreen text, and component placement may vary slightly depending on the available batch or manufacturer update. For critical industrial, commercial, or safety-related use, testing should be done before final installation. For exact product image or batch confirmation, customers can contact us on WhatsApp before placing the order.

Note

Images are for representation only. Actual product may differ slightly in colour, design, marking, or layout based on stock availability.

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