Page 38 - Basic Course
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KNX BASIC COURSE
11.1 Cable length between TP power supply unit – TP bus device
Figure 22: Cable length between TP power supply unit – TP bus device
A bus device only transmits a half wave (shown in the picture as the negative half wave at
the positive wire).
The choke as part of the power supply unit produces - together with the transformers of
the bus devices - the positive equalisation pulse.
As the choke plays a significant role in the forming of the equalisation pulse, the bus
devices may only be installed up to 350 m cable length away from the choke (power
supply unit).
Home and Building Management Systems KNX Association
KNX System overview System overview_E1213a 26/27
