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POWER SUPPLY

The installation should be performed by a qualified electrician or an 
installer with the required knowledge. The power supply should be 
connected via a clearly marked, easily accessible and close switch so the 
unit can be switched off during service work. 

Power supply 230 VAC 
The 230 VAC supply is equipped with a 3 m cable for connection to 
mains power.

Power supply 24 VAC/VDC 
Connect the external 24 V power  
supply to the push connector  
(polarity independent) on  
the Elvaco 24 VAC/VDC power  
supply according to the image on the  
right. Connect the cable from the 
power supply to the board connector  
(4).

 

INTRODUCTION

CMi5110 is a wireless M-Bus Receiver, integrated in a CMi-Box, 
handling up to 800 wireless M-Bus meters. The product can operate 
in the following wireless M-Bus modes: T1, C1 and S1. For a complete 
description of the product or for information in Swedish, visit the Elvaco 
AB website, www.elvaco.com.

OVERVIEW

CMi5110

Wireless M-Bus Receiver

1. 

Internal antenna

2. 

Push button

3. 

M-Bus slave 
connection

4. 

Board connectors (2 
pcs) power supply

5. 

Red LED

6. 

Green LED

7. 

Yellow LED

8. 

Blue LED

MOUNTING

The product is mounted in a CMi-Box or UH50/UC50/T550 meter 
from Gyr. Connect the power cable from the power supply to the 
CMi5110 as shown in the figure.

IMPORTANT  
The CMi5110 can only be powered from the following power supplies:
• 

Elvaco 230 VAC art no: 1050053

• 

Elvaco 24 VAC art no: 1050055

Carefully press the CMi5110 in the slide. Connect the M-Bus slave port 
to any 2-wire M-Bus master via screw terminal 3.

ANTENNA

The product is available with external or internal antenna.

External antenna (not included) 
Before mounting the antenna cable, the CMi-box/meter must be 
prepared. Use a scalpel and cut rubber seal as in the figure. Remove cut 
off rubber completely.

Use an 8 mm U-Wrench on the inside of the meter. 

 

1. 

SMA antenna

2. 

Antenna connector nut

3. 

Plate 1 (outside meter)

4. 

Plate 2 (inside meter)

5. 

SMA connector

Use an 8 mm socket and a torque-screwdriver. Tighten the nut to a 
torque of 120 Ncm. 

 

Mount the antenna in a suitable place. Connect the cable to the SMA 
connector. If the antenna’s range is inadequate, please contact Elvaco 
for more information about antenna options.

IMPORTANT

• 

CMi5110 should be connected to the antenna when the antenna 
wiring is done. Otherwise the SMA connector can be damaged.

• 

Do not mount the antenna close to any metallic objects.

• 

Do not mount the antenna close to the M-Bus 2-wire bus.

• 

Do not mount the antenna inside a metallic cabinet.

Internal antenna 
There is no possibility to connect an external antenna to the version of 
CMi5110 with internal antenna. If the internal antenna is inadequate, 
please contact Elvaco for information. 

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