Esphome Web 10C200 Modbus Register 3080: 43081 Exhaust flow to outside

Technical Definition

The register 43081 Exhaust flow to outside at address 3080 is used to monitor 43081 exhaust flow to outside on the Esphome Web 10C200.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: m3/h
• 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 43081 Exhaust flow to outside (Address: 3080)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=3080, 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: "43081 Exhaust flow to outside"
  address: 3080
  value_type: U_WORD
  unit_of_measurement: "m3/h"

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: Indicates the total exhaust airflow rate to the outside. Units are typically m³/h or CFM.

Troubleshooting: Fan failure, blocked ductwork, damper closed, or sensor malfunction.