RS422 to TTL Converter Module – MAX490, 15KV ESD, Full Duplex

RS422 to TTL Signal Converter Module with MAX490 Chip & 15KV ESD Protection

Upgrade your serial communication setup with this compact, high-performance RS422 to TTL bidirectional signal conversion module. Built around the industry-trusted MAX490 chip, this full-duplex module delivers fast, reliable, and long-distance data transmission — perfect for engineers, makers, and electronics enthusiasts.

Made in Mainland China.

Key Features

• Full-Duplex Two-Way Communication: RS422 interface with A, B, Y, Z lines supports ultra-long-distance transmission up to 1,000 meters, making it ideal for industrial and field applications.
• 15KV ESD Protection: Built-in 15KV electrostatic discharge protection combined with a 10-ohm current-limiting resistor shields your devices from electrostatic and overcurrent damage — extending the life of your equipment.
• TVS Diode for Surge Protection: An onboard TVS (Transient Voltage Suppressor) diode guards against lightning strikes and voltage spikes. The integrated 120-ohm termination resistor also minimizes long-distance signal reflection interference for cleaner communication.
• Visual Status Indicators: Dedicated power and data transmission indicator LEDs provide at-a-glance monitoring of module activity — no guesswork needed during setup or troubleshooting.
• MAX490 Chip Performance: This renowned chip delivers a maximum data transmission rate of 2.5 Mbps for fast, stable serial communication. The TTL side operates on a 5V DC power supply and is fully compatible with 5V logic-level signals (RXD/TXD).

Specifications

• Chip: MAX490
• Communication Mode: Full Duplex, Two-Way (RS422 ↔ TTL)
• Max Transmission Rate: 2.5 Mbps
• Max Transmission Distance: 1,000 meters
• ESD Protection: 15KV
• Termination Resistor: 120 Ohm
• Current-Limiting Resistor: 10 Ohm
• TTL Power Supply: 5V DC
• Logic Signal Compatibility: 5V (RXD / TXD)
• Module Color: Blue
• Module Dimensions: 5.0 cm × 2.7 cm (1.97" × 1.06")

What's in the Box

• 1 × RS422 to TTL Converter Module

Related Products You May Like

• 10-Pack 22AWG Glass Tube Fuse Holder 5x20mm & 6x30mm Screw
• 100W Dual-Port Car Charger for Starlink Mini – Fast Charging
• 140W USB-C Fast Charger with Auto Power-Off Overcharge Protection

For more information on electronics safety and electrostatic discharge standards, visit the National Institute of Standards and Technology (NIST).

Frequently Asked Questions

Q: What is the RS422 to TTL converter module used for?

A: The RS422 to TTL converter module is used to bridge communication between RS422 serial devices and microcontrollers or single-chip systems that operate on TTL logic levels. It enables full-duplex, two-way data transmission over long distances — up to 1,000 meters — making it suitable for industrial automation, robotics, and embedded systems projects.

Q: Is the MAX490 chip compatible with 3.3V logic systems?

A: This module's TTL side is designed to operate with a 5V DC power supply and is fully compatible with 5V logic-level signals (RXD/TXD). If your system uses 3.3V logic, a level shifter may be required to ensure proper signal compatibility and avoid potential damage.

Q: How does the 15KV ESD protection benefit my setup?

A: The 15KV ESD (Electrostatic Discharge) protection helps safeguard both the module and any connected devices from sudden electrostatic events that can occur during handling or in electrically noisy environments. Combined with the TVS diode and 10-ohm current-limiting resistor, this module provides robust protection for long-distance or industrial deployments.

Q: What do the indicator lights on the module show?

A: The module features two indicator LEDs: one for power status and one for data transmission activity. These lights make it easy to confirm the module is powered up and actively sending or receiving data — especially useful during initial setup and debugging.