User Manual

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Siemens QAX84.1/PPS2 – Flush-mounting room unit with PPS2 interface CA2N1649en_04
Building Technologies 2015-12-23
Mounting instructions
• The room unit is suitable for flush mounting
• Recommended height: 1.50 m above floor level
• The unit should not be mounted in recesses, shelving, behind curtains or doors or
above or near direct heat sources
• Avoid direct sun and drafts
• The conduit must be sealed on the device side, as currents of air in the conduit can
affect the sensor reading
• The admissible ambient conditions must be observed
• Mounting instructions are enclosed with the device
Installation
Local installation regulations must be observed.
STOP
Caution
The unit is not protected against accidental connection to AC 230 V.
Commissioning
After an interruption of the connection to the PPS2 interface, communications are only
re-established when the connected controller next polls the PPS2 addresses.
The cycle times are as follows:
RXA: 10 seconds; RXB, RXL and RXC: 3 minutes; PX: 30 seconds
When the supply voltage is connected (via the PPS2 interface) or in the event of a con-
troller reset, the following routine is executed in the controller:
Step
Function
Description
1
LCD test
All segments of the display module are operated for
approx. 5 s
2
Identification
by controller
Until the controller recognizes the room unit as a PPS2
user, the display reads:
3
Ready for oper-
ation
1 s after recognition by the controller, the room unit is
ready for operation
If the PPS2 flush-mounting room unit is connected to a L
ONMARK®-compatible control-
ler (Desigo RXC) the display can be used for help with commissioning. When the
RXT10 commissioning and service tool issues a Wink command, the room unit displays
the type of controller connected. For example:
Type of
controller
Display
RXC21.1
RXC30.1
1649z04
As an aid to commissioning, the bus coupling unit
has a service pin which has the same function as
the service pin on the room controller to which the
bus coupling unit is connected. This is useful if the
controller is not easily accessible.
Start-up characteristics
Display in response to
L
ONWORKS® device
"Wink" command
Service pin function
(LONWORKS®devices)