An industrial-grade 16-channel relay module controlled via RS485 bus using the Modbus RTU protocol. Built-in isolation protection circuits — including power supply isolation, ADI magnetic isolation, optocoupler isolation, resettable fuse, and TVS diode — ensure safe, stable, and reliable operation. Housed in a rail-mounted ABS enclosure for easy DIN rail installation.

Each relay channel supports flash-on and flash-off functions, allowing timed activation that automatically switches off after a set duration. Device addresses are configurable from 1–255, enabling multiple modules to be cascaded on a single RS485 bus.

Key Features

• 16 Relay Channels – Contact rating up to 10A 250VAC / 30VDC per channel
• Modbus RTU Protocol – Standard industrial communication via RS485
• Multiple Isolation Protection – Power supply isolation, ADI magnetic isolation, optocoupler isolation, resettable fuse, and TVS diode
• Cascadable – Configurable device address (1–255) for multi-device RS485 bus setups
• Flash-On / Flash-Off – Timed relay activation with automatic shut-off
• Reverse Polarity Protection – Prevents damage from incorrect wiring
• Dedicated Relay Driver – Built-in freewheeling diode protection for stable driving
• Rail-Mounted ABS Case – DIN rail compatible, safe and easy to install
• Status LEDs – 3 LEDs indicate MCU status and signal transceiving

Specifications

• Power Supply – 5V (included)
• Power Consumption – 0.26W standby, 4.7W with all relays active
• Interface – RS485
• Protocol – Modbus RTU (function codes 01, 03, 05, 06, 0F)
• Default Baud Rate – 9600 (supports 4800–256000)
• Parity – None, even, or odd (configurable)
• Relay Rating – ≤10A 250VAC / 30VDC

Ideal For

• Industrial automation and control systems
• Home automation with 220–240VAC appliance switching
• Multi-device RS485 networked relay control
• Applications requiring high communication reliability

Package Contents

• 1× Modbus RTU 16-Ch Relay Module
• 1× 5V 2A Power Supply (US plug with EU adapter)

Resources

• Product Wiki – Documentation, demo code, and protocol reference