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Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits
An industrial-grade 16-channel relay module controlled via RS485 bus using the Modbus RTU protocol. Built-in isolation protection circuits — including power ...
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
Jargon buster
Plain-language definitions for the technical terms used above.
- baud
- Baud is the signalling rate of a serial connection, often used as the speed setting for UART communication. Matching the baud rate matters because both connected devices must use the same setting for readable data.
- DIN
- DIN means data in, the pin where this display receives data from the controller. Connecting DIN to the correct SPI data output pin is needed for the screen to receive pixel and command information.
- DIN rail
- DIN rail is a standard metal mounting rail used inside industrial electrical cabinets. DIN rail mounting matters because it lets the controller be installed neatly alongside power supplies, relays, and other automation hardware.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs, and automation devices. Modbus support matters because it can make the controller easier to integrate with existing industrial equipment.
- Modbus RTU
- Modbus RTU is a version of Modbus commonly used over RS485 serial wiring. It matters if you need to connect the controller to industrial sensors, meters, or drives that use serial Modbus rather than Ethernet.
- reverse polarity protection
- A circuit feature that helps protect the board if power is connected the wrong way around. It matters because it can reduce the chance of damaging the breakout during wiring mistakes, especially in classroom or prototyping use.
- RS485
- RS485 is a robust wired serial communication standard often used in factories, farms, and buildings where cables may be long or electrically noisy. It matters because it lets this controller connect to industrial sensors, meters, and control equipment over longer distances than typical hobby serial wiring.
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