300+ SCADA Protocol Articles & Guides
Deep dives on Modbus, DNP3, IEC 60870-5-101/104, IEC 61850, OPC UA, Profinet, MQTT, IEC 62443, and substation automation — written for practicing engineers.
Modbus TCP Port 502: Setup, Security, Troubleshooting
Modbus TCP port 502 in depth: IANA registration, connection lifecycle, client limits, firewall rules, Wireshark filters, and the TLS secure variant on port 802.
RS-485 Wiring Guide: Best Practices, Installation Steps, and Common Mistakes to Avoid
Learn RS-485 wiring best practices with our complete installation guide. Discover tips, diagrams, and common mistakes to ensure reliable network performance.
Modbus vs DNP3: A Technical Comparison for SCADA Engineers
Technical comparison of Modbus vs DNP3 (IEEE 1815) protocols covering architecture, communication layers, reliability, and cybersecurity.
Python Modbus Libraries Comparison: The Complete 2025 Guide
Compare top Python Modbus libraries—PyModbus, MinimalModbus, Modbus-tk, and more—to choose the best library for your industrial or IoT project.
Best Free Modbus Software: 10 Tools for RTU and TCP Testing
Best free Modbus software for engineers: 10 tools for RTU, TCP, and ASCII testing. Master utilities, slave simulators, sniffers, and monitors compared.
Modbus RTU to Modbus TCP: Gateway Setup and Conversion
Modbus RTU to Modbus TCP conversion step by step: frame translation byte by byte, hardware and software gateway setup, Unit ID mapping, and timeout tuning.
Modbus RTU vs Modbus TCP: Frames and Key Differences
Modbus RTU vs Modbus TCP compared field by field: frame structure, CRC versus MBAP header, addressing, performance, and migrating serial devices to Ethernet.
Modbus Protocol Explained: RTU, TCP, ASCII, and Frames
Modbus protocol explained end to end: RTU, TCP, and ASCII variants, frame structure, function codes, master-slave architecture, and field troubleshooting.