background image

CMa12w

Indoor temperature sensor, Wireless M-Bus

IntroductIon

CMa12w is a 1-way Wireless M-Bus temperature sensor 

developed for indoor use. 

For more information about the product, please visit the 

Elvaco AB website, http://www.elvaco.com.

English

MountIng

The sensor is mounted on a wall by using the holes on the 

product rear cover. 

overvIew

confIgure settIngs vIa nfc

CMa12w is equipped with an NFC module, which can be used 

to configure settings or read data. Please refer to the user’s 

manual for more information on how to use NFC.

factory default reset

Below, the factory default settings for CMa12w are listed.

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.

• 

Do not mount the sensor in a steel cabinet. Doing so 

will dramatically decrease the signal coverage.

deMountIng

To demount the sensor, carefully insert the end of a 

screwdriver in the upper part of one of the enclosure bottom 

holes, as illustrated below.

wIreless M-bus

Upon delivery, the sensor will be deactivated with the radio 

turned off. The product will start transmitting data as soon as 

it is activated.

actIvatIon

The sensor can operate in two different modes: encrypted 

mode or unencrypted mode. Please advise your project 

manager about the best option for your specific project.

unencrypted mode

To activate the unencrypted mode:
1. 

Press and hold push button SW1 (3) for 6-10 seconds 

until the LED light (2) starts to flash quickly.

2. 

Release push button SW1.

encrypted mode

To activate the encrypted mode:
1. 

Press and hold push button SW1 (3) for at least 13 

seconds until the LED light (2) starts to flash slowly.

2. 

Release push button SW1.

oPeratIon

Upon activation, the sensor will begin transmitting wireless 

M-Bus telegrams in mode C1 every 180th second. The 

telegrams contain sensor data as well as various information 

about the product status.

Factory default settings

Transmit interval

180 seconds

Encryption mode

Off

Locked

No

2. LED light
3. Push button (SW1)
4. Serial number

IMPortant

• 

Make sure to verify that the product is activated by 

pressing SW1. If the product is set to encrypted mode, 

the LED light (2) will flash five times, if it is set to 

unencrypted mode, it will flash once.

*If the button is released in this mode. the CMa12w will return to 
inactive mode. This also applies if the button is pressed down for 
longer than 25 seconds.

IMPortant

• 

If setup lock is enabled, the device cannot be unlocked 

again.

1. NFC antenna

Reviews: