SCADA Protocols - Decode. Analyze. Master.

How IEC 60870-5-104 Works Over Ethernet — Complete Technical Guide

The IEC 60870-5-104 (IEC 104) protocol is one of the most important standards for modern SCADA and telecontrol systems.It extends the earlier IEC 60870-5-101 serial protocol by enabling communication over Ethernet and TCP/IP networks, allowing utilities and industries to operate over LAN, WAN, or even public IP networks with reliability and scalability. This article explains — in plain… Read More: How IEC 60870-5-104 Works Over Ethernet — Complete Technical Guide »

Zero-Trust Architecture for SCADA — Securing IEC 60870-5-104 Systems

Modern SCADA systems are no longer isolated. With the rise of remote substations, cloud monitoring, and IP-based protocols like IEC 60870-5-104, the traditional “trusted internal network” model is obsolete. That’s where Zero-Trust Architecture (ZTA) comes in — a cybersecurity framework that assumes no device, user, or network is inherently trustworthy.Instead, every connection must be verified, authenticated, and continuously… Read More: Zero-Trust Architecture for SCADA — Securing IEC 60870-5-104 Systems »

Adjusting Timeout Values (t0–t3) in IEC 60870-5-104 — Complete Guide

Reliable communication in IEC 60870-5-104 depends heavily on properly tuned timeout parameters. The standard defines several timing constants — t0, t1, t2, and t3 — which control connection setup, data acknowledgment, and link supervision between the controlling station (master) and the controlled station (slave/RTU). Misconfigured timeouts can cause link resets, delayed data updates, or even total communication failure.… Read More: Adjusting Timeout Values (t0–t3) in IEC 60870-5-104 — Complete Guide »

IEC 60870-5-104 Time Synchronization (CP56Time2a) — Complete Technical Guide

IEC 60870-5-104 is one of the most widely used SCADA communication protocols in power and industrial automation. One of its most critical yet misunderstood components is time synchronization, achieved using the CP56Time2a format. Accurate time coordination across remote terminal units (RTUs), intelligent electronic devices (IEDs), and control centers ensures that every event, command, and alarm can be correctly… Read More: IEC 60870-5-104 Time Synchronization (CP56Time2a) — Complete Technical Guide »

RS232 vs RS485: Key Differences, Comparison, and Pinout Explained

When comparing RS232 vs RS485, it’s essential to understand that both are serial communication standards — meaning they send data bit by bit over a single communication line. However, RS232 is designed for short, point-to-point connections, while RS485 supports long-distance, multi-device networks using differential signaling. This guide explains the key differences, pin configurations, wiring, and real-world use cases… Read More: RS232 vs RS485: Key Differences, Comparison, and Pinout Explained »

Balanced and Unbalanced Transmission in IEC 60870-5-101

In the realm of Supervisory Control and Data Acquisition (SCADA) systems, the IEC 60870-5 protocol suite is a fundamental standard for telecontrol and remote communication in power systems and industrial automation. One of the core technical distinctions within the IEC 60870-5-101 profile is between balanced and unbalanced transmission modes. These modes define how communication is initiated and managed… Read More: Balanced and Unbalanced Transmission in IEC 60870-5-101 »

RS-485 Wiring Guide: Best Practices, Installation Steps, and Common Mistakes to Avoid

The RS-485 communication standard is the backbone of many industrial and building automation systems. It allows robust and reliable data transfer across distances of up to 4,000 feet (1,200 meters) using cost-effective twisted pair cabling. This guide provides practical RS-485 wiring recommendations for RS-485 controllers, helping installers and engineers avoid communication failures and ensure long-term system stability. Understanding… Read More: RS-485 Wiring Guide: Best Practices, Installation Steps, and Common Mistakes… »

Python Modbus Libraries Comparison: The Complete 2025 Guide

When working with industrial automation, IoT sensors, or PLC communication, the Modbus protocol remains one of the most widely used standards for device interoperability. Python, with its rich ecosystem and simplicity, has become a go-to language for building Modbus clients, servers, and gateways. But with multiple Python Modbus libraries available — PyModbus, MinimalModbus, pyModbusTCP, Modbus-tk, and others —… Read More: Python Modbus Libraries Comparison: The Complete 2025 Guide »

DNP3 Protocol: How It Works, Objects, and Function Codes

The DNP3 protocol is a communication standard that moves status, measurement, and control data between a master station and remote field devices. It is standardized as IEEE 1815, and it is the dominant telemetry protocol in North American electric utilities. Water, wastewater, and oil and gas operators use it too. If you have wired an RTU to a… Read More: DNP3 Protocol: How It Works, Objects, and Function Codes »

DNP3 vs. IEC 60870-5-101: Key Differences and Similarities in SCADA Protocols

When you have finished this study on the difference between DNP3 and IEC 60870, you should be able to distinguish and identify the similarities between the two communication protocols. Comparison between DNP3 and IEC 60870-5-101 DNP3 (Distributed Network Protocol 3) and IEC 60870-5-101 are two communication protocols widely used in the field of industrial control systems (ICS) automation… Read More: DNP3 vs. IEC 60870-5-101: Key Differences and Similarities in SCADA… »