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Siemens
QAX34.3 – Room unit with PPS2 interface
CM2N1640en_04
Building Technologies
30 Jun 2009
Electrical connections
1640A
04
CP
+
CP
PPS2 interface, power supply
CP+ 1
Device power supply, PPS2 data (positive)
CP– 2
Device power supply, PPS2 data (negative)
The example below shows the room unit connected to a DESIGO RXB room controller.
16
40
A
05
PPS2
R1
2
1
CP
–
CP
+
N1
CP
+
CP
–
= Twisted pair
R1
QAX34.3 room unit
N1
RXB… room controller
Terminal layout
Wiring diagram