Question
DPT 1.001 (Switch) and DPT 1.008 (UpDown) have the same bit length and the same binary structure; only their semantic meaning differs.
Answer
True
Both DPTs belong to the 1.xxx family, which is encoded on a single bit (boolean). DPT 1.001 = Switch (on/off for general switching), DPT 1.008 = UpDown (up/down for shutters and blinds). The semantic distinction allows ETS to display the appropriate labels and icons, and lets applications behave consistently with the user's expectations.
Preparation tip
When choosing a 1-bit DPT, pick the one whose semantics match the function — even though the wire-level value is identical, mismatched DPTs hinder readability and future maintenance.
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