Heatpump Modbus Register 206: Temperature Lower Limit Of TS Setting

Technical Definition

The register Temperature Lower Limit Of TS Setting at address 206 is used to monitor Temperature lower limit of ts setting on the heatpump.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: °C
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read Temperature Lower Limit Of TS Setting (Address: 206)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=206, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "Temperature Lower Limit Of TS Setting"
  address: 206
  value_type: U_WORD
  unit_of_measurement: "°C"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[heatpump]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Sets the minimum allowable Temperature for the TS (Thermostat Setpoint) in degrees Celsius or Fahrenheit. Defines the lower boundary of the desired Temperature range.

Troubleshooting: Unusually low values may indicate a configuration error or a sensor fault causing the device to interpret an incorrect ambient Temperature.