Question

When a bus coupling unit and an application module are bought as separate components, what does the KNX documentation require regarding their origin?

KNX BasicLearnKNX Bus DevicesMedium
Answer

D — They must always be sourced from the same manufacturer

Correct: The text states the BCU and AM must always be sourced from the same manufacturer.

Source

KNX Basic Course Documentation — 1.1 — p. 123

All proposed choices (exam context)
  1. A.They may be freely combined from any KNX-certified manufacturers
  2. B.They only need to share the same medium (TP or RF)
  3. C.The BCU may be any brand but the AM must be KNX Association branded
  4. D.They must always be sourced from the same manufacturer
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Last updated: 19 May 2026

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