Why study the KNX Bus Devices block for KNX Basic?

The KNX Bus Devices block covers notions that appear repeatedly in the theory and hands-on parts of the KNX Basic exam. Mastering these questions significantly cuts the risk of stalling on this topic on exam day.

How many KNX Bus Devices questions appear in the KNX Basic exam?

Varies by session — typically 2 to 4 questions per block in the KNX Basic theory exam, plus an applied scenario in the practical part where applicable.

KNX Basic · topic block

KNX Bus Devices KNX Basic: exam questions with worked answers

Practice questions from the KNX Bus Devices block of the KNX Basic Certification certification. Detailed corrections, public sources, free to read without sign-up.

45 questions~ 41 minFree · no sign-up

Questions for the "KNX Bus Devices" topic

Q01
A functioning KNX bus device principally consists of three interconnecting parts: a bus coupling unit (BCU), an application module (AM) and an application program (AP).
TrueFalse
5. KNX Bus Devices· bus-device-components· Easy
Correct answer
True
Learning tip
The source states a functioning bus device principally consists of these three interconnecting parts.
Source: KNX Basic Course Documentation — 1.1 — p. 123
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Q02
From an electronics point of view, which two elements are integrated together to form a regular bus coupling unit (BCU)?
- A.The application module and the application program
- B.The transceiver and the microcontroller
- C.The transceiver and the digital-analog converter
- D.The programming button and the programming LED
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
B — The transceiver and the microcontroller
Learning tip
Correct: The text says the transceiver and microcontroller are integrated in a regular BCU whose electronics cannot be separated.
Source: KNX Basic Course Documentation — 1.2 — p. 124
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Q03
What are the two functions of the Physical External Interface (PEI) between a separated application module and bus coupling unit?
- A.Assigning the individual address and storing the application program
- B.Connecting the device to the KNX bus and supplying the full mains voltage
- C.Exchanging messages between the two parts and providing limited power to the application module
- D.Converting digital signals to analog and amplifying telegrams
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
C — Exchanging messages between the two parts and providing limited power to the application module
Learning tip
Correct: The text lists exactly these two functions of the PEI.
Source: KNX Basic Course Documentation — 1.1 — p. 123
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Q04
When a bus coupling unit and an application module are bought as separate components, what does the KNX documentation require regarding their origin?
- A.They may be freely combined from any KNX-certified manufacturers
- B.They only need to share the same medium (TP or RF)
- C.The BCU may be any brand but the AM must be KNX Association branded
- D.They must always be sourced from the same manufacturer
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
D — They must always be sourced from the same manufacturer
Learning tip
Correct: The text states the BCU and AM must always be sourced from the same manufacturer.
Source: KNX Basic Course Documentation — 1.1 — p. 123
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Q05
How are the bus coupling unit and application module usually arranged in a DIN rail-mounted KNX device?
- A.Inseparably connected together in one housing
- B.Always separated and joined through an external PEI
- C.As two DIN modules from different manufacturers
- D.Connected only by the KNX bus cable
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
A — Inseparably connected together in one housing
Learning tip
Correct: The text states DIN rail-mounted devices usually integrate the BCU and AM inseparably in one housing.
Source: KNX Basic Course Documentation — 1.1 — p. 124
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Q06
When a sensor's application module and bus coupling unit are physically separated (mainly with flush-mounted sensors), how are they connected?
- A.Only through the standardized KNX bus connector
- B.Through a standardized or manufacturer-specific Physical External Interface (PEI)
- C.Wirelessly via KNX-RF
- D.By soldering the application program onto the BCU
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
B — Through a standardized or manufacturer-specific Physical External Interface (PEI)
Learning tip
Correct: The text says the application module can be connected to the BCU via a standardized or manufacturer-specific PEI.
Source: KNX Basic Course Documentation — 1.1 — p. 123
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Q07
Inside an integrated KNX product, what is the role of the electronic circuit called the 'transceiver'?
- A.It runs the operating software and the application program
- B.It executes the application function such as switching a load
- C.It takes care of coupling to the medium and is responsible for sending and receiving telegrams
- D.It stores the individual address and group addresses
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
C — It takes care of coupling to the medium and is responsible for sending and receiving telegrams
Learning tip
Correct: The text defines the transceiver as the circuit handling the coupling function to the medium, responsible for sending and receiving telegrams.
Source: KNX Basic Course Documentation — 1.2 — p. 124
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Q08
Why is KNX described as a decentralized system that needs no central supervising unit?
- A.Because a central computer continuously supervises all devices
- B.Because all telegrams are routed through a mandatory master controller
- C.Because the power supply stores the application program for every device
- D.Because each bus device has its own intelligence from an integrated operating system and program memory
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
D — Because each bus device has its own intelligence from an integrated operating system and program memory
Learning tip
Correct: The text says each device's own intelligence is why KNX is decentralized and needs no central unit.
Source: KNX Basic Course Documentation — 1.2 — p. 124
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Q09
How is a TP (Twisted Pair) device usually connected to the KNX bus?
- A.Via the standardized bus connector, colour-coded dark grey/red
- B.Via a Physical External Interface (PEI)
- C.Via a mains plug at 230 V
- D.Via a white/yellow bus connector
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
A — Via the standardized bus connector, colour-coded dark grey/red
Learning tip
Correct: The text says TP devices connect to the bus mostly via the standardized bus connector (dark grey/red).
Source: KNX Basic Course Documentation — 1.2 — p. 124
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Q10
What is the purpose of putting a KNX device into programming mode with its programming button?
- A.To switch the connected electric load on or off
- B.To provide power to the application module
- C.To allow assignment of the device's individual address
- D.To couple the device to the bus medium
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
C — To allow assignment of the device's individual address
Learning tip
Correct: The text equates programming mode with assignment of the individual address.
Source: KNX Basic Course Documentation — 1.3 — p. 125
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Q11
For which two media are KNX bus coupling units currently available?
- A.Twisted Pair and Powerline
- B.Ethernet (KNXnet/IP) and RF
- C.RF and Powerline
- D.Twisted Pair (SELV) and RF (KNX-RF)
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
D — Twisted Pair (SELV) and RF (KNX-RF)
Learning tip
Correct: The text says BCUs are available for two media, Twisted Pair (SELV) and RF (KNX-RF).
Source: KNX Basic Course Documentation — 1.3 — p. 125
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Q12
Depending on their main function, bus devices are basically divided into just two classes: sensors and actuators.
TrueFalse
5. KNX Bus Devices· bus-device-components· Easy
Correct answer
False
Learning tip
The text lists three classes: sensors, actuators and controllers, not two.
Source: KNX Basic Course Documentation — 1.3 — p. 125
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Q13
Why is it rare nowadays to have a device with pure sensor or pure actuator functionality?
- A.Because controllers have replaced all sensors and actuators
- B.Because, for example, a push button with LED status display also has an actuator function and an actuator with status information also has a sensor function
- C.Because every device must contain a digital-analog converter
- D.Because pure sensors are not allowed on Twisted Pair
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
B — Because, for example, a push button with LED status display also has an actuator function and an actuator with status information also has a sensor function
Learning tip
Correct: The text gives exactly these examples of devices combining both roles.
Source: KNX Basic Course Documentation — 1.3 — p. 125
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Q14
Which sequence correctly describes how a KNX sensor works?
- A.The BCU receives a telegram from the bus and the application module switches a load
- B.The application module sends telegrams directly onto the bus without the BCU
- C.The application module reports its inputs to the BCU, which codes the data and sends it on the bus
- D.The controller reads the inputs and the sensor regulates the actuators
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
C — The application module reports its inputs to the BCU, which codes the data and sends it on the bus
Learning tip
Correct: This is the sensor data path stated in the text.
Source: KNX Basic Course Documentation — 1.3 — p. 125
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Q15
What does the bus coupling unit of an actuator do when a telegram arrives from the bus?
- A.It codes the state of its inputs and sends a new telegram on the bus
- B.It regulates the interaction between other sensors and actuators
- C.It assigns itself an individual address
- D.It decodes the telegram and passes the information to the application module, which executes the command
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
D — It decodes the telegram and passes the information to the application module, which executes the command
Learning tip
Correct: The text says the actuator's BCU receives and decodes telegrams and passes them to the AM, which executes the command.
Source: KNX Basic Course Documentation — 1.3 — p. 125
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Q16
Which statement correctly characterises a KNX controller?
- A.It regulates the interaction between sensors and actuators and has no physical inputs or outputs
- B.It detects physical variables and reports its inputs on the bus
- C.It receives telegrams and switches an electric load
- D.It supervises the whole installation as a central computer
5. KNX Bus Devices· bus-device-components· Medium
▸
Correct answer
A — It regulates the interaction between sensors and actuators and has no physical inputs or outputs
Learning tip
Correct: The text defines a controller exactly this way.
Source: KNX Basic Course Documentation — 1.3 — p. 125
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Q17
In this KNX chapter, what does the abbreviation 'PEI' stand for?
- A.Programmable Electronic Interface
- B.Physical External Interface
- C.Peripheral Equipment Input
- D.Power Extension Interface
5. KNX Bus Devices· bus-device-components· Easy
▸
Correct answer
B — Physical External Interface
Learning tip
Correct: The chapter's abbreviation list defines PEI as Physical External Interface.
Source: KNX Basic Course Documentation — Preface — p. 122
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Q18
In start/stop dimming, what does the push button transmit when the rocker is pressed for less than the parameterized time (e.g. < 500 ms)?
- A.A 'start dimming' telegram.
- B.A 'stop dimming' telegram.
- C.A cyclical 'increase brightness by 12.5 %' telegram.
- D.A switching (on/off) telegram.
5. KNX Bus Devices· application-functions-dimming· Medium
▸
Correct answer
D — A switching (on/off) telegram.
Learning tip
Correct: a press below the parameterized threshold is interpreted as a switch command; only a longer press starts dimming.
Source: KNX Basic Course Documentation — 4.1 — p. 130
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Q19
In start/stop dimming, operating the rocker longer than the parameterized time transmits a 'start dimming' telegram.
TrueFalse
5. KNX Bus Devices· application-functions-dimming· Easy
Correct answer
True
Learning tip
True. A press longer than the parameterized time is interpreted as the beginning of a dimming action ('start dimming').
Source: KNX Basic Course Documentation — 4.1 — p. 130
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Q20
In start/stop dimming, when is the 'stop dimming' telegram sent?
- A.Cyclically, every 12.5 % step.
- B.As soon as the rocker is released.
- C.Automatically once the actuator reaches 100 %.
- D.After a fixed time set in the actuator.
5. KNX Bus Devices· application-functions-dimming· Medium
▸
Correct answer
B — As soon as the rocker is released.
Learning tip
Correct: releasing the rocker generates the single 'stop dimming' telegram.
Source: KNX Basic Course Documentation — 4.1 — p. 130
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Q21
In the start/stop dimming example, below which parameterized press time is a rocker action treated as a switch telegram?
- A.Below about 50 ms.
- B.Below about 5 s.
- C.Below about 2 s.
- D.Below about 500 ms.
5. KNX Bus Devices· application-functions-dimming· Easy
▸
Correct answer
D — Below about 500 ms.
Learning tip
Correct: the course uses '< 500 ms' as the example threshold for a switching press.
Source: KNX Basic Course Documentation — 4.1 — p. 130
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Q22
According to the start/stop dimming figure, to what brightness does the dimming actuator switch when turned on (parameter dependent)?
- A.To the last reached value.
- B.Always to 100 % brightness.
- C.Always to the minimum dimming level.
- D.Always to exactly 50 %.
5. KNX Bus Devices· application-functions-dimming· Medium
▸
Correct answer
A — To the last reached value.
Learning tip
Correct: the figure notes the actuator switches to the last reached value (parameter dependent).
Source: KNX Basic Course Documentation — 4.1 — p. 130
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Q23
What brightness step does the transmitter send in each cyclical dimming telegram in the course example?
- A.Increase brightness by 1.25 %.
- B.Increase brightness by 25 %.
- C.Increase brightness by 12.5 %.
- D.Increase brightness by 50 %.
5. KNX Bus Devices· application-functions-dimming· Medium
▸
Correct answer
C — Increase brightness by 12.5 %.
Learning tip
Correct: the transmitter repeatedly sends 'increase brightness by 12.5 %'.
Source: KNX Basic Course Documentation — 4.2 — p. 131
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Q24
In the KNX dimming application, what is the counterpart to the dimming sensor (push button) function?
- A.The dimming actuator.
- B.The line coupler.
- C.The bus power supply.
- D.A second push button.
5. KNX Bus Devices· application-functions-dimming· Easy
▸
Correct answer
A — The dimming actuator.
Learning tip
Correct: the dimming actuator is the receiving counterpart that controls the lamp/ballast.
Source: KNX Basic Course Documentation — 4.3 — p. 132
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Q25
Which device determines the dimming speed in a KNX dimming application?
- A.The push button sensor that starts dimming.
- B.The dimming actuator, via its parameterized dimming speed.
- C.The bus power supply.
- D.The group address used for the telegram.
5. KNX Bus Devices· application-functions-dimming· Medium
▸
Correct answer
B — The dimming actuator, via its parameterized dimming speed.
Learning tip
Correct: every dimming actuator has a parameterized dimming speed; it is an exclusive matter of the actuator.
Source: KNX Basic Course Documentation — 4.3 — p. 132
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Q26
Blind and shutter control, like dimming, distinguishes between a brief and a long operation of the rocker.
TrueFalse
5. KNX Bus Devices· drive-control· Easy
Correct answer
True
Learning tip
True. The course states the blind/shutter operation functions similarly to dimming, distinguishing a brief from a long rocker operation.
Source: KNX Basic Course Documentation — 4.4 — p. 133
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Q27
What is the example value of the time t2, the boundary between 'slats step open/close' and 'blinds up/down'?
- A.About 50 ms.
- B.About 500 ms.
- C.About 2 s.
- D.About 5 s.
5. KNX Bus Devices· drive-control· Medium
▸
Correct answer
B — About 500 ms.
Learning tip
Correct: t2 is given as e.g. 500 ms, separating slats-step from blinds up/down.
Source: KNX Basic Course Documentation — 4.4 — p. 133
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Q28
What is T1 in drive control, and when is it typically used?
- A.It is the slats/blinds boundary time, always 500 ms.
- B.It is the blind travel time from top to bottom.
- C.It is the debouncing time for push button interfaces and binary inputs; push buttons normally need none.
- D.It is the actuator's dimming speed.
5. KNX Bus Devices· drive-control· Medium
▸
Correct answer
C — It is the debouncing time for push button interfaces and binary inputs; push buttons normally need none.
Learning tip
Correct: T1 debounces contact inputs; genuine push buttons normally require no debouncing time.
Source: KNX Basic Course Documentation — 4.4 — p. 133
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Q29
Which rocker action corresponds to which drive-control command?
- A.Brief operation drives blinds up/down; long operation steps the slats.
- B.Brief operation steps the slats; long operation drives the blinds up/down.
- C.Both brief and long operation drive the blinds up/down.
- D.Both brief and long operation only step the slats.
5. KNX Bus Devices· drive-control· Medium
▸
Correct answer
B — Brief operation steps the slats; long operation drives the blinds up/down.
Learning tip
Correct: a brief press steps the slats, a long press drives the blind up/down.
Source: KNX Basic Course Documentation — 4.4 — p. 133
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Q30
Which three group objects make up the basic drive-control object structure of a blind actuator?
- A.ON/OFF, DIM and VALUE.
- B.UP, DOWN and STOP as three separate objects.
- C.WIND, SUN and RAIN.
- D.SAFETY, UP/DOWN and SLATS.
5. KNX Bus Devices· drive-control· Medium
▸
Correct answer
D — SAFETY, UP/DOWN and SLATS.
Learning tip
Correct: the figure shows Object 1 SAFETY, Object 2 UP/DOWN and Object 3 SLATS.
Source: KNX Basic Course Documentation — 5 — p. 135
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Q31
The mask version stored in a KNX device consists of 4 bytes.
TrueFalse
5. KNX Bus Devices· device-data-and-profiles· Easy
Correct answer
False
Learning tip
The mask version consists of 2 bytes, not 4.
Source: KNX Basic Course Documentation — 2 — p. 126
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Q32
What is the 'device descriptor type 0' of a KNX device?
- A.The KNX serial number assigned in the factory
- B.The individual address of the device
- C.The manufacturer code of the application program
- D.Another name for the mask version, identifying the system-software profile
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
D — Another name for the mask version, identifying the system-software profile
Learning tip
Correct: The system-software profile is identified by a mask version, also called device descriptor type 0.
Source: KNX Basic Course Documentation — 2 — p. 126
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Q33
Which of the following is NOT normally stored in the memory of a KNX device?
- A.The ETS project backup file
- B.The system software (system stack / KNX operating system)
- C.The application program, individual and group addresses and parameters
- D.Temporary values of the system (RAM content) and the application
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
A — The ETS project backup file
Learning tip
Correct: The ETS project (and its BCU keys) is stored in the ETS, not inside the device; the device stores its system software, RAM values and the application program/addresses/parameters.
Source: KNX Basic Course Documentation — 2 — p. 126
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Q34
What happens to the temporary RAM values of a KNX device when the bus power fails?
- A.They are always retained because RAM is non-volatile
- B.They are lost, unless previously saved in non-volatile memory
- C.They are automatically uploaded to the ETS project
- D.They overwrite the mask version
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
B — They are lost, unless previously saved in non-volatile memory
Learning tip
Correct: RAM (temporary) values are lost on a bus power failure unless the device saved them earlier in non-volatile memory.
Source: KNX Basic Course Documentation — 2 — p. 126
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Q35
Under what condition can an application program be downloaded into a BCU?
- A.Any application program can be downloaded into any BCU regardless of manufacturer
- B.Only if the two devices share the same individual address
- C.The manufacturer code of the application program and of the BCU must match
- D.Only if the mask version is set to 0000h first
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
C — The manufacturer code of the application program and of the BCU must match
Learning tip
Correct: The manufacturer code of the program and of the BCU must match to allow the download.
Source: KNX Basic Course Documentation — 2 — p. 126
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Q36
How does an E-mode device report which functionality (channels) it supports?
- A.By means of device descriptor 2
- B.By means of device descriptor type 0 (the mask version)
- C.By downloading product data from the KNX Online Catalog
- D.By its KNX serial number
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
A — By means of device descriptor 2
Learning tip
Correct: E-mode devices report their supported functionality via device descriptor 2, a different descriptor than S-mode devices.
Source: KNX Basic Course Documentation — 2 — p. 126
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Q37
How are E-mode KNX devices linked and their parameters set?
- A.Only by a full ETS download of the application program
- B.Via appropriate hardware settings or via a central controller
- C.By editing the 2-byte mask version in the device
- D.Automatically, with no configuration of any kind
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
B — Via appropriate hardware settings or via a central controller
Learning tip
Correct: For E-mode devices the linking and parameter setting is ensured via hardware settings or a central controller.
Source: KNX Basic Course Documentation — 2 — p. 126
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Q38
When was System 1 technology introduced, and what is its status today?
- A.In 1991, but it has since been removed from the KNX Standard
- B.In the late 1990s, together with System 2 and System 7
- C.With the first generation of KNX devices in 1991; it is still part of the KNX Standard
- D.With ETS6.1.1, as the newest profile
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
C — With the first generation of KNX devices in 1991; it is still part of the KNX Standard
Learning tip
Correct: System 1 came with the first KNX device generation in 1991 and remains part of the KNX Standard.
Source: KNX Basic Course Documentation — 3.1 — p. 127
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Q39
What is the maximum number of group objects for a System 1 device?
- A.254
- B.65536
- C.65535
- D.12
5. KNX Bus Devices· device-data-and-profiles· Easy
▸
Correct answer
D — 12
Learning tip
Correct: System 1 supports a maximum of 12 group objects.
Source: KNX Basic Course Documentation — 3.1 — p. 127
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Q40
How many group objects can a System 2/7 device support at most?
- A.254
- B.255
- C.12
- D.65536
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
A — 254
Learning tip
Correct: System 2/7 devices support up to 254 group objects.
Source: KNX Basic Course Documentation — 3.1 — p. 127
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Q41
Which system profiles support interface objects, the KNX serial number and access control?
- A.All profiles including System 1
- B.Only System B
- C.System 2, System 7 and System B (but NOT System 1)
- D.Only System 1
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
C — System 2, System 7 and System B (but NOT System 1)
Learning tip
Correct: The table marks these features 'Yes' for System 2/7 and System B, and 'No' for System 1.
Source: KNX Basic Course Documentation — 3.1 — p. 127
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Q42
When a tool wants to read or write the memory of a System 2, 7 or B device, how must it authorize itself?
- A.With an authorization key of 2 bytes
- B.With an authorization key of 4 bytes
- C.With an authorization key of 6 bytes
- D.No authorization is needed for System 2, 7 or B devices
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
B — With an authorization key of 4 bytes
Learning tip
Correct: Access requires the tool to first authorize itself with a 4-byte authorization key.
Source: KNX Basic Course Documentation — 3.2.1 — p. 128
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Q43
From which ETS release is addressing via the KNX serial number supported by default, and what is the alternative before that?
- A.Supported by default from ETS6.1.1; ETS Apps in the MyKNX shop also provide it
- B.Supported by default from ETS4; no apps exist for it
- C.Supported by default from ETS6.1.1; but no other tool can do it
- D.Never supported by ETS; only special hardware can do it
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
A — Supported by default from ETS6.1.1; ETS Apps in the MyKNX shop also provide it
Learning tip
Correct: The feature is supported by default with ETS6.1.1, and MyKNX-shop ETS Apps also allow reading/writing the individual address without the programming button.
Source: KNX Basic Course Documentation — 3.2.2 — p. 128
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Q44
What can an ETS end user (system integrator) do with interface objects via the ETS 'Device Editor' App?
- A.Both read and freely rewrite them at will
- B.Only read them; manipulating them requires the deeper knowledge taught in the KNX tutor course
- C.Neither read nor write them
- D.Delete them to reset the device
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
B — Only read them; manipulating them requires the deeper knowledge taught in the KNX tutor course
Learning tip
Correct: The system integrator cannot manipulate interface objects but can read them with the Device Editor App; manipulation needs tutor-course knowledge.
Source: KNX Basic Course Documentation — 3.2.3 — p. 128
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Q45
Why are the maxima of 65536 group objects and 65535 group addresses described as essentially theoretical?
- A.Because no KNX device can physically store more than 254 objects
- B.Because the ETS caps every project at 254 group objects
- C.Because they are normally not reached by current applications
- D.Because the values apply only to System 1 devices
5. KNX Bus Devices· device-data-and-profiles· Medium
▸
Correct answer
C — Because they are normally not reached by current applications
Learning tip
Correct: The text calls them a pure theoretical value, normally not reached by current applications, comparable to the total address capacity of a KNX system.
Source: KNX Basic Course Documentation — 3.2.4 — p. 129
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