Elvaco CMa10 Quick Start Manual

CMa10/CMa11
Indoor temperature/humidity sensor, M-Bus

IntroductIon

CMa10/CMa11 is a 2-way M-Bus temperature/humidity
sensor developed for indoor use. The product is available with
(CMa10) or without (CMa11) LCD display.
For more information about the product, please visit the
Elvaco AB website, http://www.elvaco.com.

overvIew

4. Push button (SW1)
5. M-Bus connector
6. Serial number

MountIng

The sensor is mounted on a wall by using the holes on the
product rear cover.
IMportant
• Avoid mounting the product near supplementary heat
sources, such as kitchen stoves, or in direct sunlight.
• Make sure to mount the product at least 1.5 meters
from the floor and at least 1 meter from the nearest
radiator.
• Do not mount the product on an external wall or near a
door. If mounted over a conduit pipe, make sure that the
pipe is filled to prevent air flow.

deMountIng

To demount the sensor device, carefully insert the end of a
screwdriver in the upper part of one of the enclosure bottom
holes, as illustrated below.

M-Bus

M-Bus is a multi-drop 2-wire bus with no polarity. Use a cable
with an area of 0.25-1.5 mm
a master device. Remove the rear cover. Slide and hold the
M-Bus connector (5) to the right, connect the two wires and
slide the terminal back into position.
IMportant
• Each CMa10/11 sensor must use a unique secondary
or primary address (depending on the addressing mode
set).
• Make sure to measure the voltage over the M-Bus
connector to verify that the M-Bus master has been
connected properly. The voltage should be in the range
of 21-42 VDC.
1. LCD display*
2. Push button (SW2)*
3. NFC antenna
to connect CMa10/CMa11 to
2

confIgure settIngs vIa Ldc dIspLay*

CMa10 has two different display modes: the standard mode
and the setup mode. End-users will only have access to the
standard mode, which displays current sensor information. The
setup mode is entered using the SW1 push button (4) at the
back of the product and can be used to configure settings for
the sensor.

standard mode

Push button SW2 on the front is used to display the next page,
and get information about average, maximum and minimum
values as well as messages.

setup mode

The setup mode is entered by pressing and holding push
button SW1 (4) for 5 seconds (when LCD display is off). The
next page is displayed by pressing SW1 for 2 seconds. To
configure the value of a field, press push button SW2. If there
are more than one configurable field on a page, push button
SW1 is used to switch between them.
IMportant
• If setup lock is enabled, the device cannot be unlocked
again.

confIgure settIngs vIa nfc

CMa10/CMa11 is equipped with an NFC antenna, which can be
used to read current settings or configure a device. Please refer
to the user's manual for more information on how to use NFC.

factory defauLt reset

In order to reset CMa10 to factory default settings, enter the
setup mode and navigate to "Total Reset" . Select "y" .
Both CMa10 and CMa11 can be reset to factory default settings
via M-Bus command. Please refer to the "Application reset"
command in the user's manual for more information.
Below, the factory default settings for CMa10 and CMa11 are
listed.

Factory default settings

M-Bus baud rate
M-Bus primary address
M-Bus secondary address
LCD contrast*
2400 Bit/s
0
Serial number
52
English