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IntroductIon

The CMeX30 is a digital to analog converter (D/A module) with an 
output voltage range from 0-10 V or current output range from 4-20 
mA. The value is set through standard M-Bus commands. CMeX30 
has a high accuracy, is reliable and can be used for advanced control 
processes. For a complete description of the product or for information 
in Swedish, visit the Elvaco AB website, www.elvaco.com.

overvIew

CM

e

 

30

DIN-mounted M-Bus D/A module

1.  Serial number

2.  M-Bus connector

3.  Screw terminal for 

4-20mA/0-10V

4.  Power supply L

5.  Power supply N

6.  Status LED (green)

7.  Error LED (red)

mountIng

The CMeX30 should be mounted on a DIN-rail. The metallic clip on the 
bottom is used to mount and demount the unit from the DIN-rail. DIN-
rail enclosure must cover the terminals.

power supply

The installation must be performed by a qualified electrician or installer 
with required knowledge. The power supply should be connected to 
screw terminals (4) and (5). The voltage should be 100-240 VAC, 50/60 
Hz. The power supply should be connected via a clearly marked switch 
placed close to CMeX30, so the unit can be switched off during service 
work.

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). Connect 

the wiring to the connector (2).

ImportAnt

 

• 

All connected M-Bus slave devices must have unique primary or 
secondary M-Bus 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.

led IndIcAtIons

The product is equipped with a green and red LED. The green LED 
shows the operation status of the product. When the green LED is 
permanently on, the product is powered up and ready to use. When the 
green LED is flashing, the product is communicating via M-Bus. The red 
LED indicates that the M-Bus 2-wire is not properly connected.

green led 

Mode

Product state

Visual

On

The unit is in operation 
mode

200 ms off/ 200 
ms on/200 ms 
off/ 200 ms on

The unit has received 
M-Bus telegram  

red led 

Mode

Product state

Visual

On

M-Bus missing

connectIon of output 0-10 v

CMeX30 can be connected to any analog voltage input that can handle 
0-10 V. Connect the negative cable (signal GND) to the center terminal 
of screw terminal (3), the signal is connected to the right terminal of 
screw terminal (3).

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