Question

When a sensor's application module and bus coupling unit are physically separated (mainly with flush-mounted sensors), how are they connected?

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Answer

B — Through a standardized or manufacturer-specific Physical External Interface (PEI)

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

All proposed choices (exam context)
  1. A.Only through the standardized KNX bus connector
  2. B.Through a standardized or manufacturer-specific Physical External Interface (PEI)
  3. C.Wirelessly via KNX-RF
  4. D.By soldering the application program onto the BCU
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Last updated: 19 May 2026

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