UART TTL To RS485 Two-Way Converter

The UART TTL to RS485 Two-Way Converter Module is a compact and reliable device that facilitates bi-directional communication between TTL serial devices and RS485 networks. This module is ideal for microcontroller systems such as Arduino, ESP32, or STM32, enabling long-distance, noise-resistant communication in industrial automation and sensor networks.

Key Features of UART TTL to RS485 Two-Way Converter Module:

• Bi-Directional Communication: Supports full-duplex transmission between TTL and RS485 interfaces.
• Auto Direction Control: Automatically manages the data direction on the RS485 bus, no need for manual control.
• Wide Operating Voltage: Operates from 3.0V to 5.5V, compatible with both 3.3V and 5V systems.
• Compact Design: Small form factor suitable for embedding into compact electronic systems.
• LED Indicators: TX and RX LEDs for easy debugging and communication monitoring.

Technical Specifications of UART TTL to RS485 Two-Way Converter Module:

• TTL Interface Voltage: 3.0V to 5.5V
• RS485 Driver Chip: MAX485 or equivalent
• Communication Speed: Up to 115200bps
• Transmission Distance: Up to 1200 meters (depends on baud rate and cable quality)
• Operating Temperature: -40°C to +85°C
• Board Dimensions: Approx. 45mm x 14mm

Mechanical Specifications of UART TTL to RS485 Two-Way Converter Module:

• PCB Material: FR4 glass epoxy
• Mounting Holes: None
• Connectors: Pin header for TTL; screw terminal for RS485 A/B lines
• LEDs: TX (Green), RX (Red)

Dimensions:

• Length: 45mm
• Width: 14mm
• Height: 10mm (approx. including headers)

Mounting Options:

• Header Pin Interface: Fits breadboard or custom PCBs via standard 2.54mm pitch pins.
• Screw Terminals: Secure RS485 A/B line connection for robust field installation.

Schematic Diagram, Connection, Wiring and Pinout of UART TTL to RS485 Two-Way Converter Module:

• TTL Side: VCC, GND, TXD, RXD
• RS485 Side: A and B terminals (differential line)
• Connection Example: Connect TXD and RXD to microcontroller UART pins; A and B to RS485 bus.

Datasheet of UART TTL to RS485 Two-Way Converter Module:

• Download MAX485 Driver Chip Datasheet (PDF)

Applications of UART TTL to RS485 Two-Way Converter Module:

• Industrial Automation: Connect PLCs, sensors, and controllers over RS485 bus.
• Home Automation: Interface with Modbus devices or long-distance peripherals.
• Data Acquisition Systems: Extend communication range between microcontrollers and sensors.
• Embedded Projects: Add RS485 compatibility to Arduino, ESP32, STM32, and similar platforms.
• Building Management Systems: Integrate with HVAC, access control, and monitoring systems.

Equivalent of UART TTL to RS485 Two-Way Converter Module:

• MAX485 Module: Classic RS485 TTL converter using the MAX485 IC
• SP3485 Module: Low power RS485 module with SP3485 driver chip
• SN75176 Module: RS485 transceiver with robust EMI immunity
• CH340 RS485 USB to TTL: USB-based TTL to RS485 converter for PC interface

Package Includes:

• 1 x UART TTL to RS485 Two-Way Converter Module