MODBUS and NT18B07 7CH RS485 NTC temperature acquisition module

Configuration
1

Hi,
using a Win7-based MODBUS test software the NT18B07 module is working fine with address 9. Connected to HA there is no response. So the question is: while sensor SDM530_1_Ph1_Power ist working fine, sensor Temp_Ch0 is not responding. Maybe a configuration mistake? Is there any experience using this temperature module with HA?

Kind regards,
Peter

# MODBUS serial connection
modbus:
  - name: MODBUS1
    type: serial
    baudrate: 9600
    bytesize: 8
    method: rtu
    parity: N
    port: /dev/ttyUSB0
    stopbits: 1
    delay: 5
    timeout: 5
    sensors:
    - name: SDM530_1_Ph1_Power
      unique_id: SDM530S1A12
      slave: 1
      address: 12
      input_type: input
      count: 2
      precision: 2
      data_type: float32
      unit_of_measurement: W
      device_class: power
      
    - name: Temp_Ch0
      unique_id: Temp_Ch0
      slave: 9
      address: 0
      input_type: input
      count: 2
      scale: 0.1
      precision: 2
      data_type: float32
      unit_of_measurement: °C
      device_class: temperature
2

I’m having trouble too
I have something else on modbus that works
but with nt18b07 I have problems
I’m trying

 - name: "Return 2"
   scan_interval: 15
   address: 5
   slave: 3
   input_type: input
   scales: 0.1
   precision: 1
   device_class: temperature
   unit_of_measurement: "°C"
3

Hi there any progress on using those rs485 boards?

This is my yaml:

uart:
  id: uart_bus
  tx_pin: GPIO17  
  rx_pin: GPIO18  
  baud_rate: 9600

modbus:
  id: modbus1
  uart_id: uart_bus

modbus_controller:
- id: modbus_device
  address: 0x1   ## address of the Modbus slave device on the bus
  modbus_id: modbus1
  setup_priority: -10

sensor:
  - platform: modbus_controller
    modbus_controller_id: modbus_device
    id: temp_sensor_1
    name: "Temperature Sensor 1"
    unit_of_measurement: "°C"
    address: 0x0001  
    register_type: read  
    value_type: U_WORD  

  - platform: modbus_controller
    modbus_controller_id: modbus_device
    id: temp_sensor_2
    name: "Temperature Sensor 2"
    unit_of_measurement: "°C"
    address: 0x0002  
    register_type: read  
    value_type: U_WORD
4

I was able to make it work. It was simpler than I thougth:

uart:
  tx_pin: GPIO17
  rx_pin: GPIO18
  baud_rate: 9600
  id: uart_bus

modbus:
  id: modbus1
  uart_id: uart_bus

modbus_controller:
- id: modbus_device
  address: 0x01  # Set to the Modbus address I confirmed works with the RS485 to USB 
  modbus_id: modbus1
  setup_priority: -10
  update_interval: 5s  # Adjust the polling interval as needed

sensor:
  - platform: modbus_controller
    modbus_controller_id: modbus_device
    id: temp_sensor_1
    name: "Temperature Sensor 1"
    unit_of_measurement: "°C"
    address: 0x0000  # Register address for CH1
    register_type: holding  # Ensure the correct register type
    value_type: U_WORD
    filters:
      - lambda: if (x > 32767) return (x - 65536) / 10.0; else return x / 10.0;