esphome-climate-modbus

This an ESPHome repository for Modbus RTU connection to multiple Climate Controllers.

Following devices are already included:

• Danfoss Optyma Control - AK-RC111

I plan to build settings for multiple devices. You can help me and send functional settings or the Parameter list.

Why?

Im getting a Climate Control but this only has Modbus RTU. I havent found any project that got the device going with HomeAssistant. So i discussed with the Company who sells me the Climate System and they borrowed me a Danfoss Optyma Control where I can experiment with.

What do you need?

You will need and ESP12 ord ESP32, a RS485 bridge (6 for 10€ at Amazon). But use the one with automatic flow control. Then you will have two leds and you see the communication.

ion the modbus.yaml file you find the basic configuration. Use this as your base.

uart:
  id: mod_bus
  tx_pin: GPIO17
  rx_pin: GPIO16
  baud_rate: 38400
  parity: EVEN
  stop_bits: 1
  data_bits: 8
  rx_buffer_size: 512  

modbus:
  id: modbus1
  uart_id: mod_bus

modbus_controller:
  id: ESP_WP_Steuerung
  modbus_id: modbus1
  update_interval: 5s
  address: 0x0C

This is the main definition for a Modbus. It defines a Serial interface, a Modbus and a Modbus Controller. For the modbus Adress you have to use the exact adress of your device. You could also start with 0x0 and then you will get an error Message in the log that you got a packet from a unkown device (Danfoss 0x06).

sensor: !include { file: gen/danfoss-optyma_sensor.yaml, vars: {modbus: "ESP_WP_Steuerung"}}
binary_sensor: !include { file: gen/danfoss-optyma_binary_sensor.yaml, vars: {modbus: "ESP_WP_Steuerung"}}
number: !include { file: gen/danfoss-optyma_number.yaml, vars: {modbus: "ESP_WP_Steuerung"}}
switch: !include { file: gen/danfoss-optyma_switch.yaml, vars: {modbus: "ESP_WP_Steuerung"}}

Here you import the variables of your device. In this version - Danfoss. You will find all others in the /gen directory.

/src

How are the files in the /gen directory made? In here you will find a python script for every supported device. In the files you will find the settings for the parameters and the file will generate the yaml files.

How do i install?

First install esphome cli like in the description. https://esphome.io/guides/installing_esphome.html I prefer the virtual environment source venv/bin/activate Then compile esphome compile modbus.yaml Then install to espdevice which is already connected to your PC via USB esphome upload modbus.yaml

Done. Simple as that

I need a different device

Good for you. But don't hesitate. If you can, you can build your own generator. Just copy a file in /src and start modifying it to your Parameterlist. Dont forget to alter the name of the generated files. If you send me a parameter List I can help you start the process, but only you can test. I found out that these parameter lists are not always correct.