Product overview

Application description


The CMe3100 M-Bus Metering gateway has the potential to read, convert and deliver meter values from all types of M-Bus meters, regardless of manufacturer. This makes the device quick and easy to integrate into an existing M-Bus system. The key features of the product include:

  • An integrated M-Bus Master which can drive up to 32 unit loads (32T). By using Elvaco M-Bus Masters it is possible to extend this number up to 512 unit loads.

  • Customized meter value reports via HTTP, FTP, and e-mail.

  • A built-in web interface for easy configuring of settings.

  • Remotely updatable firmware.

  • Meter value integration via BACnet, MODBUS, REST, JSON-RPC and DLMS.

Compatibility and extensions

Licensing scheme

The CMe3100 is equipped with a flexible licensing scheme that allows its capabilities and features to be enhanced through the addition of license files. This allows for both cost-effective customization at the purchase point as well as the possibility to later extend the product functionality without changing the hardware.

Licenses are distributed as files, bound to a specific serial number. A license file may contain several licensing options, but an individual file is always required for each product.

There are two main categories of licenses available, performance and feature licenses.

The performance licenses determine, from a software perspective, how many meters may be used with the device. Licenses range from 8 to 512 meters in steps of 8, 32, 64, 128, 256 and 512.

Feature licenses enable new services in the product, for example integration protocols such as BACnet, Modbus, REST, JSON and DLMS.

To learn more about the different licenses available, see


A software update is not necessary when changing the licenses, the functionality is already part of the software and just needs the correct license file to be unlocked.


Without a license, the metering gateway is limited to 8 meters even though the integrated M-Bus master can handle up to 32 unit loads.

Integration with other products

The CMe3100 can be used in combination with an M-Bus Master from Elvaco to increase the number of slave devices it is able to drive (the device can by default drive up to 32 unit loads, where one load equals 1.5 mA). It can also be combined with an Elvaco Wireless M-Bus Receiver to receive meter reading from wireless meters using the Wireless M-Bus Protocol.

The CMe3100 is compatible with a wide range of meters, including:

  • ABB electricity meters using IR interface communication.

  • All types of M-Bus meters, regardless of manufacturer.

  • The following temperature and humidity sensors, manufactured by Elvaco: CMa10, CMa10W, CMa11, CMa11W, CMa12W, CMa20, CMa20W and the Elvaco Sense family.

Using the product with wired and wireless M-Bus

The CMe3100 can be used together with wired M-Bus meters, wireless M-Bus meters, or a combination of both. The integrated M-Bus master can handle up to 32 unit loads so for smaller systems, the CMe3100 may operate independently. For larger systems, the number of M-Bus devices the CMe3100 can drive is easily extendable through any of Elvaco’s M-Bus Masters in combination with a license upgrade.

CMe3100 has a built-in system for wireless encryption key handling and can easily be integrated in a wireless M-Bus metering system. To receive wireless meters, the CMe3100 needs to be complemented with an Elvaco wireless M-Bus receiver.


All extension devices (wireless M-Bus receivers and M-Bus masters) from Elvaco are equipped with IR interface to enable communication without any cabling.


Elvaco offers box-build turnkey solutions, containing all necessary products preconfigured, directly from factory.

Parts overview

CMe3100_Parts overview_.png

Buttons and indicators

  1. Power supply L

  2. Power supply N

  3. Green LED

  4. Red LED

  5. Serial number

  6. Yellow LED

  7. Blue LED

  8. USB master

  9. Ethernet connection

  10. USB slave

  11. M-Bus slave 1

  12. M-Bus slave 2

  13. M-Bus master

  14. IR interface

  15. Push button

LED indications

The product is equipped with LED lights. The green LED displays current operations, the red LED indicates error, and the yellow LED displays the network status. The following tables provide an explanation of each LED indication.

Table 93. Green LED

Green LED

Product state


Permanently off

No power or boot mode


Short flashes

Normal operation


50 percent on/50 percent off

Booting in progress


Permanently on

Software error indication


Table 94. Red LED


Product state


Permanently off

Normal operation


50 percent on/50 percent off

Network problems or booting in progress


Permanently on

M-Bus master short circuit protection active


Table 95. Yellow LED

Yellow LED

Product state


Permanently off

Network connection to Ethernet port is missing


Short flashes

Ongoing communication on network


Permanently on

Ethernet port connected to network


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