Ashp Modbus Register 33: Heat Pump Indoor Master Temperature Actual

Technical Definition

The register Heat Pump Indoor Master Temperature Actual at address 33 is used to monitor heat pump indoor master Temperature actual on the Ashp.

• 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 Heat Pump Indoor Master Temperature Actual (Address: 33)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=33, 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: "Heat Pump Indoor Master Temperature Actual"
  address: 33
  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[Ashp]

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

💡 Engineer's Insight

Analysis: Actual measured indoor Temperature (°C or °F) in the controlled space. Used for thermostat logic.

Troubleshooting: Zero or inaccurate readings suggest sensor failure, poor placement, or communication errors, impacting comfort control.