Advertisement
Installation notes
Note!
STOP
Commissioning notes
Response on start-up
Technical data
Supply voltage
Function data
Interfaces
Cable connections
Housing protection standard Protection standard to EN 60529
Protection class
4/6
Siemens
Building Technologies
Local installation regulations must be observed.
The room unit is not protected against connection to AC 230 V.
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 corre-
sponding 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:
Step
Function
Description
1
LED test
The LEDs are operated in sequence for 1 s each
2
Device
After a delay of 1 s the device will be ready for PPS2 communi-
ready
cation. The actual control mode is displayed after a further delay
of 5 s.
Operating voltage range
The room unit receives its power from the connected controller, via the PPS2 interface
Power consumption (from controller)
Temperature sensor
Measuring element
Measuring range
Response time
Accuracy (5 ... 30 °C)
Accuracy (25 °C)
Setpoint correction
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
room unit
Baud rate
Connection terminals (screw terminals)
Single cable length controller – Room unit
Cable type
Connecting cable for service tool
Insulation protection class
QAX33.1 – Room unit with PPS2 interface
SELV / PELV DC 12 ... 15 V
Max. 0.10 VA
NTC resistor
0 ... 40 °C
8 min
0.5 K
0.25 K
10 %
2 LEDs, yellow
PPS2
(point-to-point interface, Version 2)
4.8 kbit/s
Stranded or solid conductors
0.8 ... 2.5 mm
2
See Installation guidelines:
DESIGO RXC: CA110334,
DESIGO RXB & RXL: CM110381
DESIGO RXA: CA2Z3884
DESIGO PX: CA110396
2-core or 4-core, twisted pairs,
unscreened
Off-the-shelf, max. 3 m
IP 30
III
CA2N1642en_02
30 Jun 2009
Advertisement
