Elecbee Modbus RTU 4 Channel Relay Module with RS485 Interface & Optocoupler Isolation for Arduino

SKU: EB0046293

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Key Features

Features:

Modbus RTU & RS485 Network-Ready for Multi-Device Control: Built on Modbus RTU protocol, this module supports RS485 communication with a default address of 1 (user-modifiable via commands), enabling seamless multi-unit networking for industrial automation or Arduino-based control systems.
4CH Optocoupler Isolation for Safe Signal Handling: Features 4-channel optocoupler isolation between input (IN1-IN4) and relay outputs, preventing interference from high-voltage circuits and protecting connected MCUs (e.g., Arduino) from damage.
Arduino-Compatible with Expandable Programming: Equipped with an STM8S103F3 MCU and SWIM download interface (requires STLINK-V2), allowing users to reprogram the module for custom applications—ideal for prototyping or advanced automation projects.
Comprehensive Status Indicators for Real-Time Monitoring: Includes 4 relay-closed LEDs, a power indicator, a running LED (D5), and a user-configurable LED, ensuring clear visibility of operation, communication, and relay status at a glance.
Flexible Power & Input Design for Diverse Use Cases: Operates on 12V DC with dual power interfaces (round DC + terminal block) for easy wiring. 4 input channels read switch states via RS485 (non-output control), enhancing adaptability in smart home, industrial, or DIY projects.

Specifications

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Attribute

Value

Model

RS485

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Shipping Guide

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Description

Relay communication: multi-unit network 485 communication, based on MBDBUS-RTU protocol, the default communication address is 1, the user can modify the address by command

IN1 - IN4 are used by the switch. The status of the switch is read by 485, not by the input control relay output.

1. S1 reset button

2. D5 running LED indicator

Description:

4 channel relay output (one normally open and one normally closed)

STM8S103F3 MCU

4 channel optocoupler isolation

4 Relays Close LED Indicators

Round DC interface and terminal DC interface. Convenient power wiring (supply voltage 12V)

4 channel input interface

RS485 communication interface.

A power indicator

A User LED Lamp

Reset button
A SWIM download interface - (STLINK-V2 download program, users can develop programs twice)

Modbus-RTU-4-Channel-Relay-Module-4CH-Input-Optocoupler-Isolation-RS485-MCU-Geekcreit-for-Arduino----1400923

Modbus-RTU-4-Channel-Relay-Module-4CH-Input-Optocoupler-Isolation-RS485-MCU-Geekcreit-for-Arduino----1400923

Package includes:
1 x Modbus RTU 4 channel Relay Module

Modbus-RTU-4-Channel-Relay-Module-4CH-Input-Optocoupler-Isolation-RS485-MCU-Geekcreit-for-Arduino----1400923