Question
The device field B can address bus devices numbered 1 to 256 on a line.
Answer
False
False. B = 1...255 addresses the bus devices on a line; the maximum device number is 255, not 256. B = 0 addresses the line coupler.
Preparation tip
Device numbers 1-255 (plus 0 for the coupler); not 256.
Source
KNX Basic Course Documentation — 3.5 — p. 68
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