Esphome Web 10C200 Modbus Register 3203: 43204 Zone 4 flow demand

Technical Definition

The register 43204 Zone 4 flow demand at address 3203 is used to monitor 43204 zone 4 flow demand 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 43204 Zone 4 flow demand (Address: 3203)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=3203, 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: "43204 Zone 4 flow demand"
  address: 3203
  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: Represents the required airflow demand for Zone 4. Units are typically m³/h or CFM.

Troubleshooting: Low occupancy, sensor reading error, control system fault, or actual reduced need for airflow.