
UniLink Modbus Poll: Unihiker+modbus (Building a Portable Modbus Poller)
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In todayās fast-paced industrial environment, real-time data access is crucial for efficient monitoring and troubleshooting. Traditional fixed monitoring setups can limit mobility and slow down response times. Thatās why weāve developed a portable Modbus Poller using RainbowLink from DFRobot and UniHIKER, combined with Python and Tkinter for a flexible and user-friendly monitoring solution. Ā
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IntroductionĀ
Modbus is a widely used protocol in industrial automation, enabling seamless communication between sensors, controllers, and other devices. However, monitoring these systems often requires being at a fixed location, which can cause delays in troubleshooting and optimization. Our portable Modbus Poller changes that by offering real-time system monitoring on a compact and mobile device. Ā
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System Overview
The portable Modbus Poller integrates cutting-edge technologies to deliver a seamless and efficient monitoring experience: Ā
- RainbowLink (DFRobot): Ensures reliable and stable Modbus communication. Ā
- UniHIKER: Handles data processing and provides an interactive touchscreen for real-time display. Ā
- Python and Tkinter: Power the software, enabling customizable polling functions and a graphical user interface (GUI) for an intuitive user experience. Ā
With these components working together, the system can read and display real-time data from Modbus meters, offering instant insights for industrial applications. Ā
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Hardware and Software Integration Ā
Hardware Components Ā
- UniHIKER: Acts as the central processing unit and display interface. Ā
- RainbowLink Module:** Facilitates Modbus communication between UniHIKER and the Modbus meter. Ā
- Modbus Meter: The device from which data is read. Ā
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UNIHIKER:

RainBowLink:
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https://www.dfrobot.com/product-2879.html
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Specification
USB Interface: Type-C
Input Voltage : 5V
Baud Rate Ā Ā Ā : 2400 - 128,000 bps
TTL Level Ā Ā Ā Ā : 3.3V
TTL Channels: 2
RS485 Channel: 1
RS232 Channel: 1
Output Voltage:
Ā Ā Ā Ā 3.3V: Rated current 200mA
Ā Ā Ā Ā 5V: Directly connected to the Type-C interface (Max 2A when connected to a Type-C port on a computer; Max 500mA when connected to a USB-A port)
Ā Ā Ā Ā 12V: Rated current 800mA
Compatibility: Supports Windows and Linux; compatible with LattePanda and Raspberry Pi.Driver Requirements: Driver-free for basic functionality; installing drivers enhances performance with unique device identifiers.
Modbus Meter:

CIRCUIT:
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CASE 3D Print:
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FILE 3D:
Ā https://grabcad.com/library/unilink-modbus-poll-unihiker-modbus-1
Ā https://www.thingiverse.com/thing:6945303
https://www.printables.com/model/1187216-avatar-yakroo-sek-pin-thailand-followers-0-followi
https://cults3d.com/en/3d-model/tool/unilink-modbus-poll-unihiker-modbus
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Install and CODE:
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Install :
Ā Ā Ā pip install pymodbus
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https://github.com/YakrooThai/UNIHIKER/blob/main/EP2/modbuspoll.py
