Introduction 
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. 

System Overview

The portable Modbus Poller integrates cutting-edge technologies to deliver a seamless and efficient monitoring experience:  

- RainbowLink (DFRobot): Ensures reliable and stable Modbus communication.  

- UniHIKER: Handles data processing and provides an interactive touchscreen for real-time display.  

- Python and Tkinter: Power the software, enabling customizable polling functions and a graphical user interface (GUI) for an intuitive user experience.  

With these components working together, the system can read and display real-time data from Modbus meters, offering instant insights for industrial applications.  

Hardware and Software Integration  

Hardware Components  

- UniHIKER: Acts as the central processing unit and display interface.  

- RainbowLink Module: Facilitates Modbus communication between UniHIKER and the Modbus meter.  

- Modbus Meter: The device from which data is read. 

UNIHIKER:

RainBowLink:

Specification

USB Interface: Type-C

Input Voltage : 5V

Baud Rate       : 2400 - 128,000 bps

TTL Level        : 3.3V

TTL Channels: 2

RS485 Channel: 1

RS232 Channel: 1

Output Voltage:

       3.3V: Rated current 200mA

       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)

       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:

FILE 3D:

 https://grabcad.com/library/unilink-modbus-poll-unihiker-modbus-1

 https://www.thingiverse.com/thing:694530

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-modbu

Install and CODE:

Install :

   pip install pymodbus