RS422 to TTL Bidirectional Signal Module – Full Duplex with MAX490

Upgrade your microcontroller projects with this compact and reliable RS422 to TTL Bidirectional Signal Conversion Module. Built around the MAX490 chip, this full-duplex module provides stable, noise-resistant serial communication between RS422 and TTL logic levels — making it an essential component for industrial automation, robotics, embedded systems, and long-distance data transmission applications.

Key Features

MAX490 IC: Industry-standard driver/receiver chip ensures reliable RS422 ↔ TTL signal conversion
Full Duplex Operation: Simultaneous bidirectional data transmission for high-performance communication
Wide Compatibility: Works seamlessly with Arduino, Raspberry Pi, STM32, and other MCU platforms
RS422 Standard: Supports differential signal transmission for excellent noise immunity over long cable runs
Compact PCB Design: Easy to integrate into breadboards or custom PCB layouts
Low Power Consumption: Efficient design ideal for battery-powered or energy-sensitive projects
Plug-and-Play Ready: Clearly labeled pins for quick and accurate wiring

Specifications

Chip: MAX490
Communication Standard: RS422 Full Duplex
Logic Level: TTL (3.3V / 5V compatible)
Interface: RS422 differential + TTL UART
Application: MCU serial communication, industrial control, data acquisition

Ideal For

Embedded systems and microcontroller (MCU) serial communication
Industrial automation and PLC interfacing
Long-distance serial data transmission projects
DIY electronics prototyping and development boards

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Frequently Asked Questions

Q: What does the RS422 to TTL Signal Module with MAX490 do?

A: This module converts RS422 differential signals to TTL logic-level signals (and vice versa) using the MAX490 chip. It enables full-duplex bidirectional serial communication between RS422-standard devices and TTL-based microcontrollers such as Arduino, STM32, or Raspberry Pi.

Q: Is this module compatible with Arduino and other MCU platforms?

A: Yes! The RS422 to TTL module is compatible with most 3.3V and 5V MCU platforms, including Arduino, Raspberry Pi, ESP32, STM32, and similar development boards. Simply connect the TTL UART pins (TX/RX) to your MCU's serial port and the RS422 differential pins to your RS422 device.

Q: What is the advantage of RS422 over standard UART/TTL communication?

A: RS422 uses differential signaling, which makes it far more resistant to electrical noise and interference compared to single-ended TTL UART. This allows reliable data transmission over much longer cable distances — typically up to 1,200 meters — making it ideal for industrial and automation environments.

Q: What does "full duplex" mean for this module?

A: Full duplex means the module can transmit and receive data simultaneously on separate signal lines, allowing for faster and more efficient communication compared to half-duplex setups where only one direction can operate at a time.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.