MAX3485 TTL to RS485 Converter Module | Multi-Machine

MAX3485 TTL to RS485 Converter Module

Upgrade your microcontroller projects with the MAX3485 TTL to RS485 Converter Module — a compact, industrial-grade communication bridge that delivers ultra-long-distance signal transmission, rock-solid interference resistance, and broad voltage compatibility. Whether you're building automation systems, connecting multiple devices on a shared bus, or developing embedded MCU projects, this module is the reliable choice for professional and hobbyist engineers alike.

Made in Mainland China.

Key Features

• Ultra-Long Distance Transmission: Powered by a high-quality original MAX3485 chip, this module supports RS485 communication over distances of thousands of meters — ideal for industrial and large-scale installations.
• Dual Voltage Support (3.3V & 5V): Compatible with both 3.3V and 5V signal levels, making it easy to integrate with a wide range of microcontrollers, including Arduino, STM32, Raspberry Pi, and more.
• Easy Secondary Development: Features 2.54mm spaced perforated soldering holes, standard M3 screw mounting holes, and a built-in 120Ω terminal resistor (enable by shorting R16). Perfect for prototyping and final-version deployments alike.
• Visual Signal Indicators: Onboard power and RXD/TXD LED indicator lights give you instant visual feedback on transmission status — simplifying debugging and live monitoring.
• IO Resource Saving: The RS485 half-duplex interface frees up precious GPIO pins on your main controller while delivering outstanding noise immunity in demanding industrial environments.
• ±15kV ESD Protection: Built-in electrostatic discharge protection keeps your module and connected devices safe from voltage spikes.
• 500kbps Error-Free Transmission: The chip's slew-rate-limited driver minimizes EMI and signal reflections, enabling reliable data transfer at up to 500kbps.
• 128+ Device Bus Support: With 1/4 unit load receiver input impedance, the bus can support more than 128 devices simultaneously — perfect for multi-machine communication networks.
• Industrial Temperature Range: Operates from -40°C to +85°C, ensuring reliable performance in harsh industrial environments.
• Hot-Swappable Design: Safely hot-swap the module without signal bus disruption — a major advantage over standard RS485 chips.
• Superior Power Filtering: Tantalum electrolytic capacitors with dual high/low-frequency filtering and dual transient suppression diodes provide outstanding overvoltage protection and signal integrity.
• Large Ground Plane: Extensive copper pours on the PCB reduce signal interference and improve overall reliability.

Specifications

• Type: RS485 Communication Module
• Chip: MAX3485
• Supported Voltages: 3.3V / 5V TTL
• Max Transmission Speed: 500kbps
• Max Bus Devices: 128+
• ESD Protection: ±15kV
• Terminal Resistor: 120Ω (enable via R16 short)
• Mounting Holes: M3 standard
• Pin Pitch: 2.54mm
• Operating Temperature: -40°C to +85°C
• Product Size: 53.00 × 22.00 × 16.00 mm (2.09 × 0.87 × 0.63 in)
• Condition: New

What's in the Box

• 1× MAX3485 TTL to RS485 Converter Module

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Further Reading

For guidance on electrical safety standards in industrial electronics, refer to the NIST Industrial Wireless Systems resources. For component safety and product compliance, visit the U.S. Consumer Product Safety Commission (CPSC).

Note: Due to different monitors and lighting conditions, the actual color of the item may vary slightly from product images. Please allow ±1–2 cm measurement deviation due to manual measurement.

Learn more: ESP32

Frequently Asked Questions

Q: What microcontrollers is the MAX3485 TTL to RS485 module compatible with?

A: The MAX3485 RS485 converter module supports both 3.3V and 5V TTL signal levels, making it compatible with a wide range of microcontrollers including Arduino (Uno, Mega, Nano), STM32, ESP8266, ESP32, Raspberry Pi, and other popular MCU development boards.

Q: How many devices can I connect to the RS485 bus using this module?

A: Thanks to its 1/4 unit load receiver input impedance, this MAX3485 module supports multi-machine communication with more than 128 devices connected simultaneously on the same RS485 bus — ideal for building large sensor networks or industrial automation systems.

Q: How do I enable the built-in 120Ω terminal resistor on the MAX3485 module?

A: To enable the onboard 120Ω terminal resistor (used for impedance matching at the end of long RS485 cable runs), simply short the R16 solder jumper on the PCB. This helps reduce signal reflections and ensures reliable data transmission over long distances.

Q: What is the maximum transmission distance and speed of this RS485 module?

A: The MAX3485 TTL to RS485 converter module supports ultra-long-distance transmission of up to thousands of meters. The maximum error-free data transmission speed is 500kbps, thanks to the chip's slew-rate-limited driver design that minimizes EMI and signal reflections.