IntroductIon
The CMa10/CMa11 is a 2-way M-Bus communicating temperature and
humidity sensor for indoor use.
For a complete description of the product or for information in Swedish,
visit the Elvaco AB website, www.elvaco.com.
overvIew
CM
a
10
/
11
Indoor M-Bus temperature and humidity sensor
1. Push-button (SW2) (CMa10)
2. Display (CMa10)
3. Push-button (SW1)
4. M-Bus in
5. Serial number (secondary
address)
6. Do not use for mounting
mountIng
When mounting the CMa10/CMa11, avoid rooms with a lot of
supplementary heat, such as kitchens or south facing rooms. Position
the sensor away from direct sunlight. Avoid placing on an external wall
or near an external door. Make sure that the sensor is not positioned
closer than 1 m from the nearest radiator and at least 1.5 m above the
floor. The CMa10/CMa11 can be mounted directly on the wall, or over a
mounting box. If the CMa10/CMa11 is placed over a conduit pipe, it is
recommended to fill the pipe to prevent air flow.
Remove the rear cover to connect the M-Bus 2-wire interface.
ImPortAnt
•
Do not use mounting holes (6) as shown in overview.
•
If the product should be demounted from the wall, use a
screwdriver to separate the product from the rear cover. The
screwdriver should be inserted carefully in the upper part of the
holes.
m-Bus 2-wIre Bus
M-Bus is a multi-drop 2-wire bus with no polarity. Use a cable of area
0.25-1.5 mm
2
, e.g. a standard telephone cable (EKKX 2x2x0.5).
Demount the M-Bus terminal (4) by sliding the terminal to the right.
Connect the incoming wiring to the terminal and slide back in position.
ImPortAnt
•
All connected M-Bus slave devices must have unique M-Bus
secondary or primary addresses depending on addressing mode.
•
Measure voltage over M-Bus slave connection to verify M-Bus
master connection. Voltage should be between 21-42 VDC.
confIgure usIng lcd dIsPlAy (cmA10)
The display shows current sensor information and is also used to
change and view the CMa10 configuration, i.e. M-Bus primary and
secondary addresses. End users only have access to the Standard
menu. The Setup menu can only be entered using the push-button SW1
on the rear of the product.
standard menu
Push-button SW2 on the front is used for changing display page,
resetting received messages and average values which can be viewed
by the end user. Enter next page by pressing push-button SW2.
