Page 34 - Basic Course
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KNX BASIC COURSE
8 Symmetrical signal transmission
Figure 18: Symmetrical signal transmission
The data is transmitted symmetrically over the pair of wires. Not any of the wires is
connected to the ground or PE or has a fixed potential.
The bus device only evaluates the difference of the AC voltage between both wires.
As radiated noise affects both wires with the same polarity, it has no influence on the
difference in the signal voltage.
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