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Siemens QAX32.1 – Room unit with PPS2 interface CA2N1641en_03
Building Technologies 2015-12-23
Commissioning notes
After an interrupt of the PPS2 interface the communication will only be re-established
when the connected controller polls the PPS2 addresses. The duration of the
corresponding cycle is:
RXA: 10 sec; RXB, RXL and RXC: 3 min; PX: 30 sec.
The following routine occurs in the room unit when the power supply is connected (via
the PPS2 interface) or after a reset via the controller:
The LEDs are operated in sequence for 1 s each
2 Device
ready
After a delay of 1 s the device will be ready for PPS2
communication. The actual control mode is displayed after a
The room unit receives its power from the connected controller, via the PPS2 interface
Power consumption (from controller)
Correction range (determined by controller)
max. ± 12 K (default ± 3 K)
Accuracy over full correction range
Indication (control mode)
Type of interface between controller and
(point-to-point interface, Version 2)
Connection terminals (screw terminals)
Stranded or solid conductors
Single cable length controller
See Installation guidelines:
-core or 4-core, twisted pairs,
Connecting cable for service tool