This product is an industrial 32-ch relay module controlled via RS485 bus, adopting the Modbus RTU protocol. It includes built-in protection circuits such as power supply isolation, magnetical isolation, resettable fuse, and TVS diode, and comes with an ABS case.
The Modbus RTU 32-Ch Relay is very easy to use. With its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipment and applications requiring high communication performance.
Applications:
- Industrial Control
- Smart Home
- Smart Agriculture
- Breeding and Farming
Features:
- Configurable device address (1~255) allowing cascading of multiple devices on the RS485 bus
- Supports flash-on and flash-off functions, enabling timed relay activation
- Onboard voltage regulator chip supporting 7~36V wide power supply
- Unibody power supply isolation providing stable isolated voltage without extra supply
- Unibody magnetical isolation for signal isolation, high reliability, and low power consumption
- Resettable fuse and TVS to suppress surge and transient voltages, offering over-current, over-voltage, lightning, and anti-static protection
- Optocoupler isolation preventing interference from high-voltage circuits
- Dedicated relay driver chip with freewheeling diode protection for stronger and more stable driving ability
- Reverse-proof circuit preventing damage from incorrect wiring
- High-quality relay, contact rating ≤10A 250VAC/30VDC
- Rail-mounted ABS case, easy and safe to install
- Three LEDs indicating MCU status and signal transmission states
Specifications:
| Model | Relay Module |
|---|---|
| No. of Channels | 32 |
| Operating Voltage (VDC) | 7 to 36 |
| Communication Mode | RS485 |
| Baud Rate | 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 |
| Contact Form | 1NO 1NC |
| Contact Rating | ≤10A 250VAC/30VDC |
| Communication Protocol | Standard Modbus RTU protocol |
| RS485 Address | 1~255 |
| LED Indicator (Y/N) | RXD: Lights when receiving, STA: Flashes during normal MCU operation, TXD: Lights when sending |
Package Includes:
- 1 × Waveshare Modbus RTU 32-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits
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Read More →Technical Specifications
| Brand | WAVESHARE |
|---|---|
| Interface / Protocol | RS485 |
| SKU | AI7504 |
| Weight | 0.98 kg |
| Availability | In Stock |
Applications & Use Cases
The Waveshare Modbus RTU 32-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits is a versatile relay modules used across a wide range of applications including home automation, industrial control, IoT projects, Arduino/Raspberry Pi interfacing, and motor control.
Common use cases:
- Switching high-voltage AC appliances with a microcontroller
- Building a smart home relay board
- Automating irrigation pumps in agriculture
This product is ideal for electronics engineers, IoT developers, and automation hobbyists.
Technical Tip: Use optocoupler-isolated relay modules to protect your microcontroller. Match relay coil voltage to your MCU logic level (3.3V or 5V).
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
- Genuine WAVESHARE product sourced from authorized channels
Aanya Jain (verified owner) –
Average Waveshare Modbus RTU 32-Ch Relay Module,. Works but the relay generates some EMI. Added snubber to fix.
Shreyas Panchal –
Very satisfied. My smart home system runs on these Waveshare Modbus RTU 32-Ch Relay Module, modules. Totally reliable.
Kritika Menon –
Good quality Waveshare Modbus RTU 32-Ch Relay Module,. Using it for my college project. Performs as expected.
Isha Tiwari (verified owner) –
Love this Waveshare Modbus RTU 32-Ch Relay Module,. Click sound is satisfying and switching is instantaneous.
Ishaan Panchal (verified owner) –
Very satisfied. My smart home system runs on these Waveshare Modbus RTU 32-Ch Relay Module, modules. Totally reliable.
Pankaj Kamath (verified owner) –
Very satisfied. My smart home system runs on these Waveshare Modbus RTU 32-Ch Relay Module, modules. Totally reliable.
Darshan Reddy (verified owner) –
Good Waveshare Modbus RTU 32-Ch Relay Module,. Works well. LED indicators are helpful for debugging.
Ankit Mishra (verified owner) –
This Waveshare Modbus RTU 32-Ch Relay Module, is robust and well built. PCB quality is excellent.
Deepak Chatterjee (verified owner) –
Outstanding quality! This Waveshare Modbus RTU 32-Ch Relay Module, has been running 24/7 for months without a single failure.
Bhavna Bhat (verified owner) –
Very satisfied. My smart home system runs on these Waveshare Modbus RTU 32-Ch Relay Module, modules. Totally reliable.
Kabir Bhat (verified owner) –
Good Waveshare Modbus RTU 32-Ch Relay Module,. Works well. LED indicators are helpful for debugging.
Anushka Pandey (verified owner) –
Excellent Waveshare Modbus RTU 32-Ch Relay Module,! Switching is clean and reliable. Using it for home automation.
Atharv Solanki –
Great Waveshare Modbus RTU 32-Ch Relay Module,. Easy to integrate with NodeMCU for WiFi-based control.
Ravi Dhawan (verified owner) –
Excellent Waveshare Modbus RTU 32-Ch Relay Module,! Switching is clean and reliable. Using it for home automation.
Manoj Solanki (verified owner) –
Decent Waveshare Modbus RTU 32-Ch Relay Module,. Trigger voltage is compatible with both 3.3V and 5V logic.
Suresh Srivastava (verified owner) –
Superb Waveshare Modbus RTU 32-Ch Relay Module,! Using it to control my garden irrigation system. Very dependable.
Naveen Ghosh (verified owner) –
Good quality Waveshare Modbus RTU 32-Ch Relay Module,. Using it for my college project. Performs as expected.
Shruti Rao (verified owner) –
Great quality Waveshare Modbus RTU 32-Ch Relay Module,. All channels working. Optocoupler isolation is a nice feature.
Nikita Vohra (verified owner) –
Perfect Waveshare Modbus RTU 32-Ch Relay Module, for my IoT project. Controlling appliances remotely works flawlessly.
Pallavi Arora (verified owner) –
This Waveshare Modbus RTU 32-Ch Relay Module, works perfectly with my Arduino. Easy to wire and control.
Yashwant Khurana –
Great Waveshare Modbus RTU 32-Ch Relay Module,. Easy to integrate with NodeMCU for WiFi-based control.
Mahesh Solanki (verified owner) –
This Waveshare Modbus RTU 32-Ch Relay Module, is robust and well built. PCB quality is excellent.