RS485 CAN Dual Channel Relay Module | Modbus RTU DC7-48V
RS485 CAN Dual Channel Relay Module | Modbus RTU DC7-48V
RS485 / CAN Dual Channel Relay Module with Modbus RTU Support
Take precise control of your automation and switching projects with this robust 2-channel RS485/CAN Relay Module. Built around a stable 32-bit MCU and equipped with dedicated RS485 and CAN communication chips, this module supports the industry-standard Modbus RTU protocol for seamless integration into PLCs, microcontrollers, industrial control systems, and DIY electronics projects.
Key Features
- Wide Power Supply Range: DC 7V–48V — compatible with a broad range of power sources
- Dual RS485 & CAN Interfaces: Flexible communication options for industrial and hobbyist applications
- Modbus RTU Protocol: Standard communication for easy integration with SCADA, HMI, and automation controllers
- 2-Channel Optocoupler Input: Signal range DC 3.3V–24V with full electrical isolation for safe signal detection
- 2-Channel Relay Output: NO (Normally Open) and NC (Normally Closed) contacts — rated 10A/250V AC or 10A/30V DC
- Diode Discharge Protection: Built-in protection extends relay lifespan and shields your circuit
- High Endurance Relays: Rated for up to 100,000 continuous switching operations
- Fast Response Time: Minimal switching delay for real-time control applications
- Configurable Address & Baud Rate: Device address range 1–255 (default 255); default baud rate 9600 bps
- Compact Form Factor: 80 × 56 mm — fits easily into enclosures and project boxes
Technical Specifications
| Power Supply Voltage | DC 7V – 48V |
| Optocoupler Input Signal | DC 3.3V – 24V |
| Communication Protocol | Modbus RTU (RS485 & CAN) |
| Default Baud Rate | 9600 bps |
| Device Address Range | 1 – 255 (default: 255) |
| Relay Rating | 10A / 250V AC | 10A / 30V DC |
| Relay Endurance | 100,000 operations |
| Board Size | 80 × 56 mm |
| EU LVD Compliance | Low voltage: Below 50V AC or 75V DC |
Ideal Use Cases
- Industrial automation and PLC relay expansion
- Digital input signal detection and monitoring
- Remote power switching and load control
- Home automation and smart control panels
- Robotics and embedded systems prototyping
Package Contents
- 1× RS485/CAN Dual Channel Relay Module
Made in Mainland China.
Note: Due to monitor calibration differences, actual product color may vary slightly from images. Please allow ±1–10 mm variance due to manual measurement.
For more information on industrial control and electrical safety standards, visit the OSHA Electrical Safety Guidelines.
Frequently Asked Questions
Q: What communication interfaces does this relay module support?
A: This relay module supports both RS485 and CAN bus interfaces, and communicates using the standard Modbus RTU protocol. This makes it compatible with a wide range of PLCs, HMIs, microcontrollers, and SCADA systems.
Q: What is the input voltage range for the optocoupler inputs?
A: The optocoupler inputs accept signal voltages from DC 3.3V to 24V, providing full electrical isolation between your control signal and the relay circuit — ideal for mixed-voltage environments.
Q: Can this module switch AC loads?
A: Yes. Each of the two relay channels is rated at 10A / 250V AC (and 10A / 30V DC), making it suitable for switching a variety of AC and DC loads in both residential and industrial control applications.
Q: How do I configure the device address and baud rate?
A: The device address is configurable from 1 to 255 (factory default is 255), and the default communication baud rate is 9600 bps. Both can be adjusted via Modbus RTU commands to suit your network configuration.