Overview

A custom component for ESPHome for reading meter data sent by the Kaifa MA309M via M-Bus.

Features

• Exposes all data sent from the smart meter as sensors
• Allows grouping data together in a single report for storing in InfluxDB or similar

Supported meters

• Kaifa MA309M

Supported providers

• TINETZ-Tiroler Netze GmbH
• Salzburg Netz GmbH
• Innsbrucker Kommunalbetriebe Aktiengesellschaft
• Vorarlberger Energienetze GmbH

Exposed sensors

• Voltage L1
• Voltage L2
• Voltage L3
• Amperage L1
• Amperage L2
• Amperage L3
• Active Power Plus
• Active Power Minus
• Active Energy Plus
• Active Energy Minus
• Reactive Energy Plus
• Reactive Energy Minus

Requirements

• ESP32 (supported by ESPHome)
• RJ11 cable
• M-Bus to UART board (e.g. https://www.mikroe.com/m-bus-slave-click)
• RJ11 breakout board or soldering iron with some wires
• ESPHome 1.15.0 or newer

Notes

• Tested with ESP32-POE (should work without problems over wifi)

Software installation

This software installation guide assumes some familiarity with ESPHome.

• Clone this repository into your ESPHome config files: git clone git@github.com:DomiStyle/esphome-dlms-meter.git
• Copy the meter01.example.yaml into your ESPHome config folder and adjust it to your needs
• Don't forget to add your decryption key in meter01.yaml
• Connect your ESP
• Run esphome meter01.yaml run and choose your serial port (or do this via the Home Assistant UI)
• Disconnect the ESP and continue with hardware installation

Make sure your directory structure looks like this:

• config
  • meter01.yaml
  • esphome-dlms-meter
    • The files from this repo (espdm.h, ...)

Hardware installation

• Cut one end of the RJ11 cable and connect wires to pin 3 & 4 OR Plug RJ11 into a breakout board
• Connect everything according to this table:

ESP32	M-Bus Board	RJ11	Notes
3.3V	3V3	-	3.3V power
GND	GND	-	Ground
GPIO4	RX	-	Connect RX from the M-Bus board to TX from the ESP
GPIO36	TX	-	Connect TX from the M-Bus board to RX from the ESP
-	MBUS1	3	Connect M-Bus board to smart meter, polarity does not matter
-	MBUS2	4	Connect M-Bus board to smart meter, polarity does not matter