Esphome Web 10C200 Modbus Register 3070: 43071 Exhaust flow from inside

Technical Definition

The register 43071 Exhaust flow from inside at address 3070 is used to monitor 43071 exhaust flow from inside 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 43071 Exhaust flow from inside (Address: 3070)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=3070, 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: "43071 Exhaust flow from inside"
  address: 3070
  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: Shows the exhaust flow rate from the indoor space. Units are typically m³/h or L/s.

Troubleshooting: A zero reading could mean the exhaust fan is off, blocked, or the sensor is faulty. Check fan operation and duct for obstructions.