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.
DNP3 Implementation Levels Explained: L1 to L4
Learn the four DNP3 implementation levels (L1–L4), including their features, capabilities, and differences from basic devices to advanced systems.
Understanding DNP3 Data Objects, Groups, and Variations in SCADA Systems
Understand DNP3 data objects, groups, and variations in SCADA systems. Learn how structured data models improve efficiency, interoperability, and real-time communication.
Top Features of DNP3 That Make It Ideal for SCADA Systems
Top features of DNP3 protocol explained for SCADA systems, including event-driven communication, time-stamping, reliability, and efficient data handling.
DNP3 Event Classes Explained: How Class 0, 1, 2, and 3 Really Work in SCADA Systems
Learn how DNP3 event classes work in practice. Understand Class 0, 1, 2, and 3, polling, delays, and how real priority is engineered in SCADA.
DNP3 Secure Authentication Version 6 (SAv6): Encryption and Authorization Explained
Learn how DNP3 Secure Authentication V6 (IEEE 1815-2020) adds AES-256-GCM encryption, AMP authorization, and LESS key management to SCADA systems.
DNP3 Port Number Explained: TCP/UDP 20000, Secure Port 19999, and Firewall Configuration
Learn about the DNP3 port 20000 — its purpose, configuration, security measures, and best practices for safe SCADA communication in industrial networks.
DNP3 Report by Exception, Background Polls, and Balanced Communication
Explore DNP3’s report by exception mode, periodic background polls, and balanced communication that improve SCADA efficiency and reliability.
DNP3 System Topology Explained: Master, Multidrop, and Hierarchical
Learn about DNP3 system topologies — master–slave, multidrop, hierarchical, and multiple-master — used in SCADA communication networks.
DNP3 Message Structure Explained
Explore how DNP3 messages are structured across layers — from APDU to CRC frames — ensuring reliable and secure SCADA communication.
DNP3 Secure Authentication Version 5 (SAv5): Strengthening SCADA Communication Security
Learn how DNP3 Secure Authentication (SAv5, IEEE 1815-2012) protects SCADA systems using cryptographic challenge–response verification and message integrity checks.
DNP3 IIN (Internal Indications) Bits Meaning & SCADA Troubleshooting Guide
Learn what DNP3 IIN bits are, how they work, and how to decode internal indications in SCADA systems for reliability, event handling, and cybersecurity monitoring.
DNP3 Protocol: How It Works, Objects, and Function Codes
DNP3 protocol explained with IEEE 1815-2012 detail — the four layers, object groups and variations, all 33 function codes, IIN bits, and conformance levels.