Esphome M30 Modbus Register 232: m30 2 period

Technical Definition

The register m30 2 period at address 232 is used to monitor m30 2 period on the Esphome M30.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: Hz
• 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 m30_2_period (Address: 232)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=232, 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: "m30_2_period"
  address: 232
  value_type: U_WORD
  unit_of_measurement: "Hz"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esphome M30]

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

💡 Engineer's Insight

Analysis: Measurement period duration (e.g., seconds or minutes) for energy calculation.

Troubleshooting: Zero value suggests a configuration error or a stopped timing mechanism.