Page 81 - Basic Course

KNX BASIC COURSE

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Red Black < 18 V Save

RPP 20 V
20 V
5 V
5 V
µC

< 4,5 V Reset
0 V
Receive
Driver Logic Send
Enable

KNX

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Bus Coupling Unit

Figure 3: Transceiver

The TP transceiver has the following functions:

Separation or superimposing of the direct current and data
Reverse voltage protection (RPP)
Generation of stabilised voltages of 5 V DC respectively 20 V DC
Initiating a data back-up if the bus voltage drops below 18 V
Triggering a processor reset if the voltage drops below 4,5 V
Driver for transmitting and receiving
Sending and receiving logic

Home and Building Management Systems KNX Association
KNX Bus Devices Bus devices_E1213a 7/16