Coupler

If you want to connect an application module to the KNX bus in your building automation, you need a bus coupler. Here you can find out which functions a bus coupler can take on and which device is suitable for you and your application. As a specialist center for building automation, the eibabo® shop offers you all the components you need to set up simple and complex installations at top conditions. Our product range extends from sensors and actuators, control units and power supplies to motors and drives.

What is a bus coupler?

Within conventional electrical installations, the function of a system results from the type of wiring. The use of the KNX bus system makes the functionality significantly more flexible. Here the function of the system is determined by the application (software) and the parameterization of individual KNX participants. KNX participants are application modules such as buttons, switches, actuators, weather stations, motion detectors, shutter actuators and so on. This has clear advantages. If, for example, the requirement changes, the function can be adapted by changing the parameterization. The installation itself remains unchanged. To implement such an installation, a so-called KNX bus line is usually laid in addition to the line for the mains voltage. This carries 30V DC and is used to transmit the signals for switching, controlling, regulating or monitoring between all participants.

Source: eibabo®, Jung 2070 U KNX bus couplerImage: Jung 2070 U KNX bus coupler

A universal interface is required so that the KNX participants can send and receive signals to one another. The KNX bus coupler is this interface between the application modules and the KNX bus. Bus couplers are available as permanently connected combination devices together with application modules or as a separate module for flush-mounting, surface-mounting and installation. With the latter, the function of the bus coupler only results from the plugging in of an application module and its parameterization by the device-specific application.

What tasks does a bus coupler take on?

The bus coupler is responsible for all tasks that directly affect the KNX system in any way. The bus coupler makes the so-called bus voltage available to the application modules. Nothing works without electricity and many of these modules do not have a separate power supply. With very simple application modules, the bus coupler records their sensor data and actuator functions and processes them in such a way that they are 'understood' by other participants. Finally, the bus coupler takes over the actual processing of the data traffic. The application modules establish the connection to the user. In addition to buttons, motion detectors and controllers, these can also be display panels, motors or signaling devices.

The KNX bus coupler with program memory

A KNX bus coupler with program memory consists on the one hand of the transmitter module, which defines the connected medium. On the other hand, there is the bus coupler controller with a microcontroller for organizing the data traffic. The manufacturer's system software is permanently stored there. It cannot be changed by the user. The device-specific application and the information for parameterization are stored in another so-called flash memory or ROM read-only memory. The device receives this during commissioning or when the parameterization is changed via the bus (S mode).

Good to know

When configuring KNX devices, we differentiate between E-mode and S-mode. In E-mode, the bus coupler is supplied with the application (software) loaded. In S mode, the function of the device is only determined when the application is loaded. Normally, the application (via the ETS) is loaded into the bus coupler.


This defines the desired functions of the device, for example:

  • Affiliation to group addresses
  • whether an actuator should dim or switch
  • which dimming speed should be maintained
  • at which basic brightness it starts and where the end point is
  • what happens after a power failure and power recovery
  • and so forth

 

This data remains stored even in the event of a power failure. Current measured values and switching states are stored in the RAM memory and are lost in the event of a power failure or when the device is reset.

The KNX bus coupler without program memory

Memory-intensive functional logic and address extensions, as well as controllers and chipsets, are increasingly being outsourced to the application modules. These bus couplers without program memory consist only of the media-specific transmission module with the digital interface to the application microcontroller. These are only used to manage group addresses and ensure standardized data traffic according to the KNX protocol.

How is the interface between the bus coupler and user module structured?

The interface to the user module consists of a standardized plug connection with 10 poles. Both the power supply and the data exchange are implemented via this.

How do I recognize whether a device already has a bus coupler?

You can purchase and install the bus coupler and user module either separately or as a permanently connected complete device. Each KNX device with a red/black bus connection terminal already has a bus coupler.

 


Please note:

In the case of series installation devices (REG devices for electrical distribution for mounting on DIN rails), the bus coupler is not visible as an individual device, but is integrated in the device.


 

Examples of this are KNX switching actuators or KNX dimming actuators.

Which devices do not have an integrated bus coupler?

With push button sensors, you often have to order the bus coupler separately from the push button. The end device (e.g. temperature controller, motion detector or touch sensor) is plugged onto the bus coupler via a multi-pin application interface. However, pushbutton sensors and room controllers (combined pushbuttons with room temperature controllers) including bus couplers are increasingly being supplied. Therefore, pay attention to the item description and prices.

Are bus couplers and user modules compatible across manufacturers?

As a rule, you have to order the bus coupler manufacturer-specifically to match the application modules. The device-specific application program must also be from the same provider. For example, you cannot operate a Gira KNX push button sensor with a Hager KNX bus coupler.

eibabo® has all KNX bus couplers from the relevant KNX brand manufacturers in its portfolio. These include in particular ABB, Berker, Busch-Jaeger, Gira, Hager, Jung, Lingg & Janke, Merten, Siemens and Theben.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Installation bus systems > Bus coupler for bus system you will find items from the following product groups:

Item overview:

  • Bus coupler
  • Bus coupler module
  • Bus technology
  • Button coupler
  • Control panel
  • Control unit
  • Home electronics
  • Interface
  • Interface converter
  • Light control
  • Presence detector
  • Radio system
  • Socket cover
  • Tactile sensor
  • Transducer
  • Wind control


from the following manufacturers:

Manufacturer overview catalogue Coupler:

  • ABB
  • Berker
  • Busch Jaeger
  • Eltako
  • Gira
  • Issendorff
  • Jung
  • Lingg & Janke
  • Siemens
  • Steinel
  • Warema


 
If you want to connect an application module to the KNX bus in your building automation, you need a bus coupler. Here you can find out which functions a bus coupler can take on and which device is... read more »
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Coupler - interface between KNX participants and KNX bus

If you want to connect an application module to the KNX bus in your building automation, you need a bus coupler. Here you can find out which functions a bus coupler can take on and which device is suitable for you and your application. As a specialist center for building automation, the eibabo® shop offers you all the components you need to set up simple and complex installations at top conditions. Our product range extends from sensors and actuators, control units and power supplies to motors and drives.

What is a bus coupler?

Within conventional electrical installations, the function of a system results from the type of wiring. The use of the KNX bus system makes the functionality significantly more flexible. Here the function of the system is determined by the application (software) and the parameterization of individual KNX participants. KNX participants are application modules such as buttons, switches, actuators, weather stations, motion detectors, shutter actuators and so on. This has clear advantages. If, for example, the requirement changes, the function can be adapted by changing the parameterization. The installation itself remains unchanged. To implement such an installation, a so-called KNX bus line is usually laid in addition to the line for the mains voltage. This carries 30V DC and is used to transmit the signals for switching, controlling, regulating or monitoring between all participants.

Source: eibabo®, Jung 2070 U KNX bus couplerImage: Jung 2070 U KNX bus coupler

A universal interface is required so that the KNX participants can send and receive signals to one another. The KNX bus coupler is this interface between the application modules and the KNX bus. Bus couplers are available as permanently connected combination devices together with application modules or as a separate module for flush-mounting, surface-mounting and installation. With the latter, the function of the bus coupler only results from the plugging in of an application module and its parameterization by the device-specific application.

What tasks does a bus coupler take on?

The bus coupler is responsible for all tasks that directly affect the KNX system in any way. The bus coupler makes the so-called bus voltage available to the application modules. Nothing works without electricity and many of these modules do not have a separate power supply. With very simple application modules, the bus coupler records their sensor data and actuator functions and processes them in such a way that they are 'understood' by other participants. Finally, the bus coupler takes over the actual processing of the data traffic. The application modules establish the connection to the user. In addition to buttons, motion detectors and controllers, these can also be display panels, motors or signaling devices.

The KNX bus coupler with program memory

A KNX bus coupler with program memory consists on the one hand of the transmitter module, which defines the connected medium. On the other hand, there is the bus coupler controller with a microcontroller for organizing the data traffic. The manufacturer's system software is permanently stored there. It cannot be changed by the user. The device-specific application and the information for parameterization are stored in another so-called flash memory or ROM read-only memory. The device receives this during commissioning or when the parameterization is changed via the bus (S mode).

Good to know

When configuring KNX devices, we differentiate between E-mode and S-mode. In E-mode, the bus coupler is supplied with the application (software) loaded. In S mode, the function of the device is only determined when the application is loaded. Normally, the application (via the ETS) is loaded into the bus coupler.


This defines the desired functions of the device, for example:

  • Affiliation to group addresses
  • whether an actuator should dim or switch
  • which dimming speed should be maintained
  • at which basic brightness it starts and where the end point is
  • what happens after a power failure and power recovery
  • and so forth

 

This data remains stored even in the event of a power failure. Current measured values and switching states are stored in the RAM memory and are lost in the event of a power failure or when the device is reset.

The KNX bus coupler without program memory

Memory-intensive functional logic and address extensions, as well as controllers and chipsets, are increasingly being outsourced to the application modules. These bus couplers without program memory consist only of the media-specific transmission module with the digital interface to the application microcontroller. These are only used to manage group addresses and ensure standardized data traffic according to the KNX protocol.

How is the interface between the bus coupler and user module structured?

The interface to the user module consists of a standardized plug connection with 10 poles. Both the power supply and the data exchange are implemented via this.

How do I recognize whether a device already has a bus coupler?

You can purchase and install the bus coupler and user module either separately or as a permanently connected complete device. Each KNX device with a red/black bus connection terminal already has a bus coupler.

 


Please note:

In the case of series installation devices (REG devices for electrical distribution for mounting on DIN rails), the bus coupler is not visible as an individual device, but is integrated in the device.


 

Examples of this are KNX switching actuators or KNX dimming actuators.

Which devices do not have an integrated bus coupler?

With push button sensors, you often have to order the bus coupler separately from the push button. The end device (e.g. temperature controller, motion detector or touch sensor) is plugged onto the bus coupler via a multi-pin application interface. However, pushbutton sensors and room controllers (combined pushbuttons with room temperature controllers) including bus couplers are increasingly being supplied. Therefore, pay attention to the item description and prices.

Are bus couplers and user modules compatible across manufacturers?

As a rule, you have to order the bus coupler manufacturer-specifically to match the application modules. The device-specific application program must also be from the same provider. For example, you cannot operate a Gira KNX push button sensor with a Hager KNX bus coupler.

eibabo® has all KNX bus couplers from the relevant KNX brand manufacturers in its portfolio. These include in particular ABB, Berker, Busch-Jaeger, Gira, Hager, Jung, Lingg & Janke, Merten, Siemens and Theben.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Installation bus systems > Bus coupler for bus system you will find items from the following product groups:

Item overview:

  • Bus coupler
  • Bus coupler module
  • Bus technology
  • Button coupler
  • Control panel
  • Control unit
  • Home electronics
  • Interface
  • Interface converter
  • Light control
  • Presence detector
  • Radio system
  • Socket cover
  • Tactile sensor
  • Transducer
  • Wind control


from the following manufacturers:

Manufacturer overview catalogue Coupler:

  • ABB
  • Berker
  • Busch Jaeger
  • Eltako
  • Gira
  • Issendorff
  • Jung
  • Lingg & Janke
  • Siemens
  • Steinel
  • Warema
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RECOMMENDED
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Busch Jaeger - 6120/12-101 - KNX bus coupler 6120/12-101
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($129.70 RRP***)
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Berker - 80040001 - KNX bus coupler 80040001
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