Esphome Web 10C200 Modbus Register 3011: 43012 Highest measured CO2 ppm

Technical Definition

The register 43012 Highest measured CO2 ppm at address 3011 is used to monitor 43012 highest measured co2 ppm on the Esphome Web 10C200.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: ppm
• 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 43012 Highest measured CO2 ppm (Address: 3011)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=3011, 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: "43012 Highest measured CO2 ppm"
  address: 3011
  value_type: U_WORD
  unit_of_measurement: "ppm"

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: Highest measured concentration of Carbon Dioxide in parts per million (ppm).

Troubleshooting: Zero suggests no CO2 detected or sensor malfunction. Ensure proper ventilation and sensor placement.