Question
Which devices decrement the routing counter of a telegram?
Answer
D — Every line-/backbone coupler and every line repeater that passes the telegram on.
Source
KNX Basic Course Documentation — 3.14 — p. 78
All proposed choices (exam context)
- A.Only backbone couplers, never line couplers or repeaters.
- B.Only the sending device, once, before transmission.
- C.The receiving actuator when it executes the command.
- D.Every line-/backbone coupler and every line repeater that passes the telegram on.✓
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