Category Archives: DNP3 Protocol

In Distributed Network Protocol (DNP3), the Internal Indications field—commonly known as IIN—plays a fundamental role in real-time SCADA diagnostics. Whether you’re troubleshooting substation RTUs, assessing communication integrity, or analyzing unsolicited events, DNP3 IIN bits provide the device’s internal status and operational health. This article explains DNP3 IIN bits in depth, their function in DNP3, how Wireshark displays them,… Read More »

The DNP3 protocol — short for Distributed Network Protocol version 3 — is a robust and reliable communication standard primarily used in SCADA (Supervisory Control and Data Acquisition) systems. It was designed to enable efficient, secure, and interoperable communication between control systems (master stations) and remote field devices such as RTUs (Remote Terminal Units) and IEDs (Intelligent Electronic… Read More »