What is KNX? Standardized Protocol for Smart Building Automation

What is KNX?

KNX (formerly Konnex) is a globally standardized protocol for building automation (according to ISO/IEC 14543-3). It is used to control a wide range of building functions such as lighting, heating, ventilation, shading, security, and energy management.

Thanks to its open standard, KNX is brand-independent, meaning that devices from different manufacturers can work together seamlessly.

KNX is widely used in office buildings, commercial facilities, industrial environments, and increasingly in residential and smart home applications.

How Does KNX Work?

KNX devices communicate via a bus-based system, where all components are connected to the same two-wire line (the KNX bus). Each device—whether it’s a sensor, actuator, or controller—can communicate directly with other devices.

The communication is decentralized: no central server is required. Each device contains its own logic and function, making the system scalable, robust, and flexible.

KNX supports multiple transmission media:
• Twisted pair (TP1) – Most common in wired installations
• Powerline (PL) – Data over existing power lines
• RF (radio frequency) – For wireless applications
• IP (KNXnet/IP) – For integration into modern networks

Which Functions Can Be Automated with KNX?

KNX enables centralized and intelligent control of various building functions, including:
• Lighting (on/off, dimming, scenes)
• Climate control (heating, cooling, ventilation)
• Shading (screens, blinds, shutters)
• Access control and intrusion detection
• Energy management and monitoring
• Occupancy detection and daylight control
• Visualization via touchscreens, apps, or SCADA systems

Benefits of KNX

• Interoperability: Works with thousands of certified devices from multiple manufacturers
• Flexibility: Easily expandable and adaptable without complete rewiring
• Energy Efficiency: Optimizes energy use through automation
• Robustness: Operates locally and is not dependent on internet connectivity
• Long-Term Standard: Over 30 years in development and globally adopted

KNX and IoT / Industrial Applications

KNX is increasingly integrated with IoT platforms and industrial automation systems:
• Integration with DALI: For advanced lighting control
• Connection to PLCs and SCADA: Via gateways or KNXnet/IP
• Monitoring and Data Analysis: Linked to cloud platforms or dashboards
• Use in Smart Buildings: In combination with sensors, routers, and other network components

Thanks to its openness, KNX is a suitable choice for organizations aiming to combine building automation with industrial networks and IoT architectures.

More Information

Contact us at +31 (0)85 0443500 or info@thingsdata.com, or explore our KNX-compatible solutions in the Thingsdata webshop.