Question
How does a bidirectional KNX RF device access the bus?
Answer
D — It checks whether the channel is free; if it is occupied it waits until free, then transmits
Correct: bidirectional devices listen first and only send once the channel is free.
Source
KNX Basic Course Documentation — 3.3 — p. 146
All proposed choices (exam context)
- A.It transmits immediately regardless of channel state
- B.It transmits continuously until an acknowledgement arrives
- C.It can only receive and never transmits
- D.It checks whether the channel is free; if it is occupied it waits until free, then transmits✓
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