Integrate Sailer Friwasta via Modbus

Configuration
1

Hello,
After setting up the sensor values ​​from my fresh water station via YAML and adding them to a dashboard, I am experimenting with various settings—such as temperatures. To do this, I have included the following code for the `number` entity in my Modbus YAML:

  - name: "Sailer Frischwasserstation"
    type: tcp
    host: 192.168.***.***
    port: 502
    sensors:
      - name: Friwa_Vorlauf
        slave: 1
        address: 5
        input_type: input
        unit_of_measurement: °C
        state_class: measurement
        scale: 0.1
        offset: 0
        precision: 1
        data_type: int16
      - name: Friwa_Warmwasser
        slave: 1
        address: 6
        input_type: input
        unit_of_measurement: °C
        state_class: measurement
        scale: 0.1
        offset: 0
        precision: 1
        data_type: uint16
      - name: Friwa_Zirkulation
        slave: 1
        address: 8
        input_type: input
        unit_of_measurement: °C
        state_class: measurement
        scale: 0.1
        offset: 0
        precision: 1
        data_type: uint16
      - name: Friwa_Rücklauf
        slave: 1
        address: 16
        input_type: input
        unit_of_measurement: °C
        state_class: measurement
        scale: 0.1
        offset: 0
        precision: 1
        data_type: uint16
      - name: Friwa_Soll
        slave: 1
        address: 186
        input_type: holding
        unit_of_measurement: °C
        state_class: measurement
        scale: 0.1
        offset: 0
        precision: 1
        data_type: uint32
# --- Durchfluss & Leistung ---
      - name: "Friwasta Frischwasserfluss"
        unique_id: friwasta_frischwasserfluss
        address: 230  # EA 0073 (Hex 73 = Dezimal 115)
        slave: 1
        input_type: holding
        unit_of_measurement: "l/min"
        state_class: measurement
        scale: 0.1
        precision: 1
        data_type: uint32
      - name: "Friwasta Aktuelle Leistung Primärpumpe Klein"
        unique_id: friwasta_leistung_primaerpumpe_klein
        address: 92  # EA 002E (Hex 2E = Dezimal 46)
        slave: 1
        input_type: holding
        unit_of_measurement: "%"
        state_class: measurement
        offset: 0
        precision: 1
        data_type: uint32
    binary_sensor:
      - name: "Friwasta Zirkulationspumpe Status"
        unique_id: friwasta_zirkulationspumpe_status
        address: 284  # Hex: EA 008F -> Dezimal 143 (Ausgang A5)
        slave: 1
        input_type: holding
        data_type: uint32
        device_class: running
    # --- SCHREIBBARE TEMPERATUREN (SCHIEBEREGLER) ---
    numbers:
      - name: "Frischwasser Solltemperatur"
        address: 186
        write_method: write_multiple_registers # Erzwingt den Funktionscode 16
        input_type: holding                    # Nutzt Funktionscode 03 zum Lesen
        data_type: uint32
        scale: 0.1                             # Dividiert beim Lesen durch 10 / Multipliziert beim Schreiben
        precision: 1                           # Zeigt eine Nachkommastelle an (z.B. 45.5 °C)
        unit_of_measurement: "°C"
        min_value: 30                          # Optional: Mindestwert zum Schutz vor Falscheingaben
        max_value: 90                          # Optional: Maximalwert zum Schutz vor Falscheingaben
        step: 0.5

Unfortunately, neither the number entities nor the binary sensor are being created—or at least I can’t find them (I’m still new to HA)…
Does anyone happen to have an idea? Many thanks in advance…

2

binary_sensors: with s.
Modbus doesn’t have numbers and even if it had, you are using address that is already used on sensors. You could use climates for temperature. Docs have example.

3

Thanks for the note regarding the numbers… however, according to the manufacturer’s instructions, the starting addresses for reading and writing the variables are identical, whereas the function codes are not:
Read: 03 00 BA 00 02
Write: 10 00 BA 00 02 04 00 00 02 58

4

@Karosm Are you sure that a fresh water station falls into the ‘Climate’ category?

5

No. And I don’t even know what that R/W register really is. Usually you have separate registers for actual temperature and set point. That’s how climates component is configured.

And I personally use modbus via esphome.