KNX: The Standard in Home and Building System Technology

KNX is a uniform, manufacturer-independent communication protocol for intelligently networking state-of-the-art home and building system technologies. KNX is used to plan and control energy-efficient solutions for more functionality and convenience while simultaneously reducing energy costs.

KNX System Features:

  • A distributed bus system that allows devices to exchange information directly
  • Bus voltage: 24 VDC (+6/-4 V)
  • CSMA/CA protocol protects against data loss resulting from telegram collisions.

  • Up to 12,000 bus nodes can be connected

  • Data transmission rate of 9.6 kBit/s, termination resistors not required

KNX Simply Explained

For more than 20 years, KNX has proven itself as a global standard for home and building automation in accordance with EN 50090 and ISO/IEC 14543. A great advantage of KNX is its remote configuration: Instead of a central device, the functions are accommodated in the individual bus subscribers. The sensors, such as switches and presence detectors, send control commands directly to the lights, blinds, heating and ventilation systems. Assignments and functions are easily configured in the “Engineering Tool Software” (ETS) and can be modified or adjusted at any time.

KNX supports different transmission media, e.g., twisted-pair cable (KNX TP), ETHERNET (KNX IP), radio (KNX RF) or Powerline (KNX PL). With KNX, devices from different manufacturers are compatible and can be flexibly combined in one comprehensive solution. As each device has its own microprocessor, no control station is required.

Variable and Individualized – Using KNX in Building Automation

As an open standard, KNX technology provides a uniform, convenient user interface for home and building automation – from residential to commercial applications. Thanks to a broad range of applications, numerous devices and systems can be linked together with KNX. For example, this allows a networked system consisting of lighting, shading and HVAC to be easily controlled in commercial and utility buildings according to user requirements.

The individual components of a KNX system include sensors and actuators. Sensors such as thermostats, switches or wind gauges, generate commands in the form of telegrams. These telegrams are turned into actions by the actuators (e.g., switching relays for blinds or lighting). A two-wire bus line provides the connection, and thus telegram traffic, between sensors and actuators. As a result, individual system components do not have to be networked, which significantly reduces the amount of wiring.

Your Benefits:

  • Easy configuration and commissioning

  • Numerous manufacturers can use a large device portfolio

Functionality and Convenience: WAGO and KNX

With the KNX IP Controller (750-889) and the KNX TP1 Module (753-646), WAGO provides an innovative and upgradable solution to building automation. Connectivity to conventional sensors and actuators, as well as complex connections to DALI, EnOcean and others, are cost-effectively unified on the WAGO KNX IP Controller. The WAGO KNX TP1 Module connects to TP1 networks. ETHERNET as a medium, along with KNX IP as a transmission protocol, enable high-speed communication between devices while providing seamless integration into existing infrastructures.

Together, the KNX IP Controller and the KNX/TP1 Module make up the KNXnet IP Router, which connects traditional TP1 networks to ETHERNET. This considerably increases the transmission speed within a KNX network. It also enables a high level of data traffic on the backbone, preventing a bottleneck to the superimposed visualization system. The KNX IP Router also acts as a network interface for the ETS software for configuration and parameter setting. The respective product databases/plug-ins for the KNX IP Controller, KNX TP1 Module and KNX IP Router do more than support device-specific configuration. For convenient use, they are designed so that you can apply already known and proven methods and procedures of the ETS.

WAGO and KNX Advantages:

  • Freely programmable applications offer high project flexibility
  • Ability to connect digital and analog sensors, actuators and subsystems (e.g. DALI, EnOcean, etc.)
  • High speed, fast response times and larger amounts of data on devices directly connected to the ETHERNET
  • Complete integration of twisted-pair devices
  • KNX IP Controller can be combined with the KNX TP1 Module for versatile applications

KNX Products from WAGO

Recommended Reading


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The Standard Motor Interface (SMI) is the standardized electrical interface for roller shutter and sunblind drives.


The Standard in Lighting Control – DALI

The “Digital Addressable Lighting Interface” (DALI) is a communication protocol for lighting applications in buildings.


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