Analog and Digital Signal Monitoring Over Rs-485 using Modbus RTU
DOI:
https://doi.org/10.15662/IJEETR.2026.0802130Keywords:
Arduino Uno, RS-485, Modbus RTU, Industrial Monitoring, Fault Detection, Signal Acquisition, Embedded SystemsAbstract
In modern industrial applications, reliable monitoring of electrical systems is essential to ensure safety, efficiency and uninterrupted operation. This project presents an Analog and Digital Signal Monitoring System developed with a focus on robust communication and centralized supervision. The local End has an Arduino Uno that acquires analog and digital signals, convert using its 10-bit ADC, and performs threshold-based fault detection. Immediate fault detection is provided locally through LEDs and a Buzzer, ensuring rapid alerting at the site of operation. For centralized supervision, data from the Local end ARDUINO Uno is transmitted over RS-485, a noise- resistant and scalable communication standard capable of supporting long distances up to 1200 meters, and the structured using the Modbus RTU protocol. The Remote end, equipped with another Arduino Uno, receives the data, extracts it, and displays real-time voltage readings, system status and fault conditions on a 16x2 LCD, allowing operators to monitor the system without physically being present at the local end. The system is modular and scalable, supporting multiple Local ends for large industrial setups. Experimental results confirm accurate signal acquisition, reliable communication, immediate local fault alerts and centralized visualization highlighting the system as a practical, robust and scalable solution for industrial monitoring applications
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