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Siemens
QAX34.1 – Room unit with PPS2 interface
CA2N1645en_02
Building Technologies
30 Jun 2009
Connection terminals
The tool socket on the room unit provides access to the connected individual room
controller via the commissioning and service tool or the service terminal.
The bus cable (Terminals 3 and 4) is therefore looped to the tool socket (Pins 1 and 2).
The bus cable is not affected by the room unit.
For connection of a service terminal, the PPS2 interface (Terminals 1 and 2) is also
connected to the tool socket.
8
7
6
5
4
3
2
1
C–
C+
CP
–
CP
+
80085
PPS2 interface, supply voltage
CP+
1
Device supply, Data PPS2 (pos.)
CP–
2
Device supply, Data PPS2 (neg.)
Bus connection (looped to tool socket)
C+ 3 With
L
ON
W
ORKS
® bus (DESIGO RXC): CLA
C– 4 With
L
ON
W
ORKS
® bus (DESIGO RXC): CLB
5 ... 8
Not used
Standard type RJ45 tool socket.
1
320
6Z01
2 3 4 5 6 7 8
With L
ON
W
ORKS
® bus (DESIGO RXC): CLA
With L
ON
W
ORKS
® bus (DESIGO RXC): CLB
Not used
Not used
Not used
Not used
CP+
Data PPS2
CP– Data
PPS2
Connection diagram (Example: RXC)
The following example shows the room unit connected to a DESIGO RXC room
controller:
17
41
A
03
PPS2
Tool
A
R1
B
7 8 1 2
4 3 2 1
C–
C+
CP
–
CP
+
N1
CP
+
CP
–
CLA
CLB
PPS2
LonWorks® Bus
= Twisted pair
R1 Room
unit
QAX34.1
N1 Room
controller
RXC...
A
Connection for RXT10 commissioning and service tool
B
Connection for service terminal with PPS2 interface
Terminal layout
Tool socket
.
.
.
