Question
What preamble length does a KNX RF-Multi sender use in a slow channel (compared with 15 ms fast and 5 ms Ready)?
Answer
D — 500 ms
Correct: a slow-channel RF-Multi sender uses a 500 ms preamble, letting receivers sleep longer and save battery.
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An error or unclear wording? Report this questionAll proposed choices (exam context)
- A.50 ms
- B.5 ms
- C.15 ms
- D.500 ms✓
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