The Industrial 8-Channel Modbus RTU Relay Module (D) is a top - notch RS485 - controlled relay module with 8 digital inputs, tailor - made for industrial use. It operates on the Modbus RTU protocol and comes with multiple isolation protections such as power, magnetic, and TVS diode isolation to keep noise at bay. Housed in a durable ABS rail - mounted enclosure, it's a breeze to install and perfect for automation and industrial control systems.
**Key Features**
- **Reliable Communication**: It uses RS485 with Modbus RTU support. You can set the address from 1 - 255 and cascade multiple devices.
- **Robust Protections**: Power, magnetic, TVS diode, and optocoupler isolation offer excellent noise immunity.
- **Flexible Relay Control**: 8 relay outputs driven by a dedicated chip. It has flash - on/flash - off functions for timed switching, and digital inputs support linkage or toggle control.
- **Wide Voltage Range**: Works smoothly on 7 - 36V DC.
- **Durable Build**: The ABS rail - mount case ensures a secure installation.
- **LED Indicators**: Status LEDs show 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
- **Indicators**: STA for MCU status, TXD for transmit data, RXD for receive data.
**Setup & Testing**
1. Install the provided FTDI drivers.
2. For RS485 testing, connect A - A and B - B. Then use SSCOM or Modbus Poll software to send commands.
3. It's compatible with Raspberry Pi (via RS485 CAN HAT, Python control), STM32 (via RS485 CAN Shield, C control), and 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
- **FAQs**: It works with Windows, Mac, Linux, and Android. You can change relay modes with Modbus commands. Make sure to wire A - B properly for RS485 stability.
Using this Industrial 8 - Channel Modbus RTU Relay Module (D) is easy. First, install the FTDI drivers that come with it. Then, for testing the RS485 connection, connect the A pins together and the B pins together. You can use software like SSCOM or Modbus Poll to send commands and check if it's working. This module is compatible with many devices like Raspberry Pi, STM32, and Arduino. Just use the appropriate shields and programming languages as described.
When using it, remember to wire the RS485 A and B pins correctly to ensure stable communication. The module can operate on a wide voltage range of 7 - 36V DC, but make sure your power supply is within this range.
For maintenance, keep the module in a clean and dry environment. The ABS rail - mount case is durable, but avoid physical damage. If you want to change the relay modes, you can use Modbus commands. And don't worry about compatibility; it works well with Windows, Mac, Linux, and Android operating systems.
