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Siemens
Wall-mounted sensors and room operator units for KNX/ETS and KNX/ACS
CM2N1602en_05
Building Technologies
Functionality / Use
2018-09-14
The digits "0xxx" and "00xx" are displayed on power-up:
0xxx is the FW version
00xx is the Build version
4.4 Functions
The room operator units with control functions can be integrated in a KNX network.
The control functions for room temperature and ventilation allow for immediate
control of suitable actuators to control heating, cooling, and ventilation.
4.4.1 Measuring
The room operator units measure the room temperature via an integrated sensing
element. The room temperature can be transmitted to other bus members and
serves in KNX as control variable of the integrated room temperature controller.
The outdoor temperature received via the KNX bus is only used for indication on
the display and has no effect on the control.
The room operator units acquire the relative humidity in the room with the aid of a
humidity sensing element integrated in the front module. The relative room
humidity can be transmitted to other bus members and serves in KNX as control
variable of the integrated ventilation controller.
The room operator units determine the CO
2
concentration via infrared absorption
measurement (NDIR). The sensor provides exact measurements at all times and
does not require maintenance or recalibration thanks to an integrated, stable
reference light source. The CO
2
concentration can be transmitted to other bus
members and serves in KNX as control variable of the integrated ventilation
controller.
The background-lit symbol informs on the current level of CO
2
in the room. The
colors
green
/
orange
/
red
of the background lighting indicate
good
/
moderte
/
poor
air quality. The display can be switched on or off by another bus member, e.g.
switch or timer.
Temperature
(All Types)
Relative humidity
(QMX3.P70, QMX3.P74)
CO
2
concentration
(QMX3.P70, QMX3.P74)
Air quality indication
(QMX3.P70)
