Zakaria El Intissar

I've spent 13 years in power system automation, electrical protection, and SCADA communication, as an automation and industrial computing engineer. ScadaProtocols.com is where I turn what I've learned on site into plain guides and working tools — so other engineers can decode, analyze, and troubleshoot industrial communication protocols without the guesswork.

Author Archives: Zakaria El Intissar

IEC 61850 Security: Threats, IEC 62351, and How to Protect Your Substation

IEC 61850 transformed substation automation. It replaced hardwired copper connections with standardized Ethernet-based communication between intelligent electronic devices (IEDs). GOOSE messages trip breakers in under 4 milliseconds. MMS connects IEDs to SCADA systems. Sampled Values stream real-time voltage and current measurements. But this transformation came with a trade-off. By moving protection and control communications onto Ethernet, substations inherited… Read More: IEC 61850 Security: Threats, IEC 62351, and How to Protect… »

Modbus Security Risks and How to Protect Your Industrial Network

Modbus was built in 1979 for a world where industrial networks were physically isolated. There was no internet, no remote access, and no reason to worry about authentication or encryption. The protocol was designed for reliability and simplicity — not security. That was fine for decades. But today, industrial control systems are increasingly connected to corporate networks, cloud… Read More: Modbus Security Risks and How to Protect Your Industrial Network »

How to Set Up Modbus TCP/IP Communication: Step-by-Step Guide

Modbus TCP/IP brings the simplicity of the Modbus protocol onto modern Ethernet networks. Instead of serial cables and RS-485 wiring, you use standard Ethernet infrastructure — switches, routers, and Cat5e/Cat6 cables. The protocol works the same way as Modbus RTU at the application level. You still read holding registers, write coils, and use the same function codes. The… Read More: How to Set Up Modbus TCP/IP Communication: Step-by-Step Guide »

How to Configure Modbus RTU Over RS-485: Step-by-Step

Modbus RTU over RS-485 is the most common serial communication setup in industrial automation. It connects PLCs, sensors, drives, meters, and other field devices on a simple two-wire bus. The protocol itself is straightforward. But getting it to work reliably depends on getting the details right — wiring, termination, addressing, baud rate, parity, and register mapping all need… Read More: How to Configure Modbus RTU Over RS-485: Step-by-Step »

How to Configure DNP3 Communication Between Master and Outstation

If you work with SCADA systems in the electric, water, or oil and gas sectors, chances are you will deal with DNP3 at some point. It is one of the most widely deployed protocols for communication between control centers and field devices. But configuring DNP3 properly is not always straightforward. There are multiple layers to set up, addresses… Read More: How to Configure DNP3 Communication Between Master and Outstation »

IEC 62443 Explained: A Practical Guide to Industrial Cybersecurity Standards

IEC 62443 is the international family of standards for the cybersecurity of industrial automation and control systems. If you operate a plant, a substation, a water utility, a pipeline, or any facility that depends on PLCs, SCADA, DCS, or safety systems, this is the standard your security program should be built around. That’s the short version. The longer… Read More: IEC 62443 Explained: A Practical Guide to Industrial Cybersecurity Standards »

Industrial Cybersecurity: Complete Guide to OT & ICS Security

Industrial cybersecurity has become a critical priority for every organization that operates factories, power plants, water systems, or any facility where digital systems control physical processes. The threat landscape in 2026 is clear: ransomware groups target industrial operators for profit, nation-states target critical infrastructure for leverage, and the growing connectivity of OT systems gives both of them more… Read More: Industrial Cybersecurity: Complete Guide to OT & ICS Security »

OPC UA Client-Server Architecture Explained: Sessions, Services, and Subscriptions

Every OPC UA interaction starts with a simple concept: a client asks, a server answers. But beneath that simplicity sits a carefully layered architecture that handles discovery, security, sessions, subscriptions, and more — all defined in the IEC 62541 standard. This guide explains how the OPC UA client-server architecture works from the ground up. Whether you’re developing an… Read More: OPC UA Client-Server Architecture Explained: Sessions, Services, and Subscriptions »

OPC UA Companion Specifications Explained: 60+ Industry Standards in One Guide

OPC UA gives machines a common language. But a common language isn’t enough if everyone uses different vocabulary. A packaging machine and a robot arm both “speak” OPC UA — but how they describe themselves, their data, and their capabilities needs to follow a shared standard too. That’s what companion specifications do. They define standardized data models for… Read More: OPC UA Companion Specifications Explained: 60+ Industry Standards in One… »