Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards |
| Origin | - |
| Microcontroller | STM32F103C8T6 (ARM Cortex-M3) |
| Communication Interfaces | RS485 (2-way or 3-way configurable) |
| Supported Protocol | Modbus RTU |
| Operating Voltage | 5V DC via USB or Terminal Block |
| Logic Level | 3.3V TTL compatible |
| Baud Rate Support | 1200 to 921600 bps |
| Isolation | Opto-isolated RS485 ports |
| Programming Interface | SWD / JTAG |
| PCB Dimensions | 75mm x 55mm |
| Application Scope | Industrial Control, IoT Gateway, Sensor Networking |
Anonymous
Mar 31, 2026
Rating: 5/5
Robust industrial performance
Been running this board connected to three different sensors for a month straight. No dropouts, stable communication, and the opto-isolation gives great peace of mind against voltage spikes.
Anonymous
Mar 22, 2026
Rating: 4/5
Solid converter board
We used these to bridge old PLCs to a new SCADA system. They work reliably. The only improvement would be adding screw terminals for power input instead of just headers.
Anonymous
Mar 08, 2026
Rating: 5/5
Excellent learning tool
As a student learning about industrial protocols, this board is perfect. It's plug-and-play with Keil and STM32CubeIDE. Highly recommend for anyone wanting to understand Modbus deeply.
Anonymous
Mar 08, 2026
Rating: 4/5
Great value, minor documentation gaps
Hardware quality is excellent for the price. The STM32 chip handles multiple serial channels without lag. I deducted one star because the pinout diagram in the manual could be clearer for the 3-way configuration.
Anonymous
Mar 03, 2026
Rating: 5/5
Exceeded expectations
The build quality is surprisingly good. Soldering joints are clean, and the component layout is logical. Successfully deployed 10 units in a pilot project with zero failures so far.
Anonymous
Mar 01, 2026
Rating: 5/5
Perfect for Modbus projects
This board saved me weeks of design time. The RS485 isolation works flawlessly in our noisy factory environment, and the Modbus RTU implementation was straightforward using the provided libraries.
Q: What is the maximum distance supported for the RS485 connection?
A: The theoretical maximum distance for RS485 is up to 1200 meters (4000 feet) at lower baud rates, provided you use high-quality shielded twisted pair cabling and proper termination resistors.
Q: How do I switch between 2-way and 3-way modes?
A: The mode is selected via hardware jumpers labeled 'CH_SEL' on the PCB. Please refer to page 4 of the user manual for the specific jumper settings to enable the third channel.
Q: Does this board support both half-duplex and full-duplex RS485?
A: Yes, the board supports half-duplex RS485 by default. With specific jumper configurations and firmware adjustments, it can be adapted for full-duplex RS422/485 applications depending on the channel setup.
Q: Is the source code for the Modbus library included?
A: Yes, we provide a GitHub repository link in the product wiki containing example projects, the Modbus RTU stack source code, and pin configuration files for STM32CubeIDE.
Q: Can I power this board directly from a 24V industrial supply?
A: No, the onboard regulator accepts input typically up to 5V-12V depending on the specific revision. For 24V industrial supplies, please use an external DC-DC buck converter to step down to 5V before connecting to the board.
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