Question
Which notation is used in ETS for a Group Address in the 3-level structure?
Answer
B — Main/Middle/Sub (e.g. 1/2/3)
Group Addresses in the 3-level structure use the notation Main/Middle/Sub, for example 1/2/3. Choice A uses the dot separator, which is reserved for individual addresses — a classic exam trap. Choice C corresponds to the 2-level structure (Main/Sub, e.g. 1/3), not the 3-level one. Choice D is not a KNX format at all.
Preparation tip
Remember: 3 levels = Main/Middle/Sub with slashes; 2 levels drops the middle field. Dots are exclusively for individual addresses.
All proposed choices (exam context)
- A.Area.Line.Device (e.g. 1.2.3)
- B.Main/Middle/Sub (e.g. 1/2/3)✓
- C.Group/Subgroup (e.g. 1/3)
- D.Hex (e.g. 0x102003)
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