Modbus RS485 - Need assistance to setup thermostat BecaSmart BHT-1000 Modbus

Configuration
1

Hi all,
I’m pretty new to HA and have one challenge where your support would help me a lot. I need to integrate thermostats BecaSmart BHT-1000 via modbus.

My current status:

  1. I connected the Thermostat via a USB-Adapter. // Status: I can’t see the USB device under discovery. Should I?

  2. configruation.yaml
    I added what I found regarding modbus serial adapters in the //Modbus intergration .

Details:

#Modbus for Thermostats
modbus:
    - name: "Thermostat1"
      close_comm_on_error: true
      delay: 5
      timeout: 5
      type: serial
      baudrate: 9600
      bytesize: 8
      method: rtu
      parity: E
      port: /dev/ttyUSB0
      stopbits: 1
  1. Dashboard: Does not show anything yet.
  2. I know that I now need to configure read/write but I’m unfortunately lost how to configure this.

I would really appreciate if someone could support me with this setup!

Thanks,

Leiste

2

Modbus Details of the Thermostat

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image1333×1897 218 KB

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image1314×1697 180 KB

4

Hello.
Looking at these instructions, my thermostats are very similar. These is my yaml. It’s working fine.

# Example yaml: full udp connection
  - name: modbus_hub
    type: serial
    port: /dev/ttyUSB0
    baudrate: 9600
    bytesize: 8
    method: rtu
    parity: N
    stopbits: 1
    
    delay: 0
    message_wait_milliseconds: 30
    timeout: 5
    
    # Example configuration.yaml entry
    sensors:
      - name: "Temp Princ"
        unique_id: tem_prin
        unit_of_measurement: °C
        slave: 2
        address: 1
        scan_interval: 10
        input_type: holding
        device_class: temperature
        scale: 0.1
        offset: 0
        precision: 1
        data_type: uint16