Question
What does the bus coupling unit of an actuator do when a telegram arrives from the bus?
Answer
D — It decodes the telegram and passes the information to the application module, which executes the command
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
All proposed choices (exam context)
- 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✓
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