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Blog Efficient building automation: the role of bus systems
Blog

Efficient building automation: the role of bus systems

23. June 2025
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Simply explained: What is a bus system?

A bus system is like a data highway within an electronic system. This is a shared management or a networkvia which various devices and components can send and receive data. Instead of each device being directly connected to every other device, they all share this one communication linewhich simplifies simplifies the cabling and increases efficiency.

Why is it called a bus system?

The term “bus” comes from the Latin word omnibuswhich means “for all”. In electronics and data processing a “bus” on a common communication mediumwhich is used jointly by several components to transmit data. A bus system enables different devices or components, to exchange data via a common linesimilar to a public transportation bus carrying different passengers on a common route. common route transported.

What bus systems are available?

In building automation and electronics in general, there are various types of bus systems in buildings. Here is an overview:

     

    BACnet (Building Automation and Control Networks)

    A communication protocol specifically for building automation that enables the integration of different systems.

    BACnet Secure Connect

    BACnet/SC heralds a new era in modern IT infrastructure. BACnet/SC is the first type of encrypted BACnet communication.

    Modbus

    A widespread protocol for industrial automation that is often used in building automation.

    KNX (Konnex)

    A globally recognized standard for building automation that enables interoperability between devices from different manufacturers.

    M-Bus (meter bus)

    A bus system for transmitting consumption data from meters (e.g. water, gas, electricity).

    Optimize your building with the help of intelligent bus systems!
    Rely on modern building automation and let us work together to find the best solution for you.

    Get in touch with us! We’re glad to help.

    BACnet/SC provides the previously missing and increasingly important IT security in building automation

    BACnet Secure Connect (BACnet/SC) adds an additional protocol layer to the existing BACnet standard. It retains full compatibility with existing BACnet networks, while at the same time enabling improved interoperability between different building automation systems.

    The network and security mechanisms used are based on modern IT standards and create significantly more flexibility when setting up and adapting networks as well as in configuration and change management during operation. However, certificate management represents a key challenge for the industry: All BACnet/SC-capable devices require valid certificates, which must be renewed regularly in order to ensure permanently secure data communication.

    How can bus systems be subdivided?

    Bus systems can be subdivided in various ways. You will find the most common subdivisions in the following section:

  • By type of communication

    Serial bus systems: Data is transmitted one bit at a time (e.g. USB).

    Parallel bus systems: Several data bits are transmitted simultaneously (e.g. older printer interfaces).

  • By application

    Internal bus systems: Connect components within a device (e.g. PCI, FSB).

    External bus systems: Connect devices outside the main device (e.g. USB, Ethernet).

  • By network type

    Fieldbuses: Used in industrial automation to connect sensors, actuators and control devices (e.g. Modbus).

    Building buses: Used in building automation to control HVAC, lighting and security systems (e.g. KNX, BACnet).

  • Product highlights

    With the numerous bus systems, you benefit from numerous features and advantages. Discover them now.

  • Effizienz

    Bus systems reduce the cabling effort considerably, as several devices can be connected via a single cable. This leads to lower installation costs and easier maintenance.

  • Flexibility

    With bus systems building automation systems can be easily extended or modified without the need for extensive structural alterations. This makes them particularly attractive for growing or changing requirements.

  • Interoperability

    Many bus systems, especially standards such as KNX and BACnet, promote interoperability between devices from different manufacturers. This enables a larger selection of products and solutions that are compatible with each other.

  • Future security

    As bus systems are based on established standards, they offer a high degree of future security. New devices and technologies can be integrated into existing systemswithout having to replace them completely.

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      Bus systems – modern building automation

      In summary, bus systems can be described as crucial components of modern building automation. They not only offer efficient communication between different devices and systemsbut also significantly reduce the cabling effort and increase the flexibility for future expansions. With their ability to integrate different manufacturers and technologies, they are Bus systems such as KNX and BACnet essential for networked and intelligent building control. Would you like to find out more about how bus systems can increase your building efficiency? We will be happy to advise you!

      Interest aroused?

      Then contact us! We’re glad to help.