Esphome Web 10C200 Modbus Register 3072: 43073 Exhaust Temperature from inside

Technical Definition

The register 43073 Exhaust Temperature from inside at address 3072 is used to monitor 43073 exhaust Temperature from inside on the Esphome Web 10C200.

• Protocol: Modbus RTU
• Data Type: S 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 43073 Exhaust temperature from inside (Address: 3072)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=3072, 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: "43073 Exhaust temperature from inside"
  address: 3072
  value_type: S_WORD
  unit_of_measurement: "°C"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esphome Web 10C200]

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

💡 Engineer's Insight

Analysis: Measures the Temperature of the air being exhausted from the indoor space. Units are °C or °F.

Troubleshooting: An abnormal Temperature could indicate a faulty sensor, issues with the HVAC system impacting exhaust air, or no airflow.