The edl21 integration lets you read German EDL21 smart meters using SML from Home Assistant.

In order to connect to the smart meter, an infrared transceiver is required.

Compatible transceivers:

Tested smart meters:

  • APATOR Norax 3D (enable InF Mode as described in manual to retrieve full data)
  • DZG DWS76 (enable InF as described in manual to retrieve full data)
  • Iskraemeco MT175 (ISKRA MT175-D2A51-V22-K0t)
  • EMH metering eHZ Generation K (enable InF as described in manual to retrieve full data)
  • efr SGM-C4 (enable InF as described in manual to retrieve full data)
  • easymeter Q3 (Link)


To set it up, add the following information to your configuration.yaml file:

  - platform: edl21
    serial_port: /dev/ttyUSB0

Configuration Variables

name string (Optional)

The friendly name of the smart meter.

serial_port string Required

The device to communicate with. When using ser2net, use socket://host:port.

InF Mode

To enable InF mode there are different steps needed based on the meter type but most commonly you have to enter the PIN you received from your grid operator. Once you have it, enter it into the meter and switch to the InF menu where you can switch from InF=Off to InF=On. Entering this can be done using a flashlight or (if available) via the physical button on the meter.

For the efr SGM-C4 it is:

  • flashing three times to enter pin mode
  • entering pin using quicker flashes, wait for 3 seconds for next digit
  • pin accepted
  • flashing 7 times to get to InF=OFF
  • 5-second flash to switch to InF=OFF

You will now get more readings like current Power, Voltage, and phase angle. Some meters don´t have this, in that case only an overall reading is provided.


To use this integration with a remote transceiver you could use ser2net.

Example ser2net.conf configuration file:

2001:raw:0:/dev/ttyUSB0:9600 8DATABITS NONE 1STOPBIT