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Industrial Modbus RTU 8-Channel Relay Module (D) with Digital Input and RS485 Interface
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The Industrial Modbus RTU 8-Channel Relay Module (D) is a reliable RS485-controlled relay module with 8 digital inputs. Designed for industrial applications,...
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The Industrial Modbus RTU 8-Channel Relay Module (D) is a reliable RS485-controlled relay module with 8 digital inputs. Designed for industrial applications, it supports the Modbus RTU protocol and includes multiple isolation protections like power, magnetic, and TVS diode isolation. It features an ABS rail-mounted enclosure for durability and easy installation, making it ideal for automation and industrial control systems.
Features
- Reliable Communication: RS485 with Modbus RTU support, configurable address (1-255), and multi-device cascading.
- Multiple Protections: Power isolation, magnetic isolation, TVS diode, and optocoupler isolation for noise immunity.
-
Flexible Relay Control:
- 8 relay outputs with a dedicated driver chip.
- Flash-on/flash-off functions for timed switching.
- Digital inputs support linkage or toggle control.
- Wide Voltage Range: Operates on 7-36V DC.
- Durable Build: ABS rail-mount case for secure installation.
- LED Indicators: Status LEDs for MCU operation, TX, and RX communication.
Specifications
- Power: 7-36V DC
- Interface: RS485
- Baud Rate: 4800 - 256000 (default: 9600, N, 8, 1)
- Relay Outputs: 8 channels (≤10A 250VAC/30VDC)
- Digital Inputs: 8 (5-36V, NPN/PNP), optocoupler-isolated
- Protocol: Modbus RTU
- RS485 Address: 1-255
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Indicators:
- STA: MCU status
- TXD: Transmit data
- RXD: Receive data
Setup & Testing
- Driver Installation: Use provided FTDI drivers.
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RS485 Testing:
- Connect A-A, B-B.
- Use SSCOM or Modbus Poll software to send commands.
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Compatible with:
- Raspberry Pi (via RS485 CAN HAT, Python control)
- STM32 (via RS485 CAN Shield, C control)
- Arduino (via RS485 CAN Shield, Arduino IDE)
Applications
- Industrial automation
- Smart home systems
- Remote relay control
- Equipment monitoring
Resources & Support
- Software: SSCOM, Modbus Poll, SecureCRT
- Example Code: Python, C, Arduino
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FAQs:
- Works with Windows, Mac, Linux, and Android.
- Change relay modes with Modbus commands.
- Ensure proper A-B wiring for RS485 stability.
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.
- IDE
- Short for Integrated Development Environment, a program used to write, run and manage code. It matters because some learners prefer a traditional coding workspace instead of a guided notebook-style lesson.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- 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.
- 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.
- Shield
- An add-on board that plugs into a main controller board to give it extra features such as sensing, motor control or communication. Knowing a product supports shields helps you judge whether it can connect neatly into an existing maker-board setup.
- STM32
- STM32 is a family of microcontroller chips commonly used in embedded electronics. Knowing a product uses an STM32 can help when looking at firmware updates, pin connections, or low-level serial control options.
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