Pana Relais I2C Ds18B20 Modbus V2 Modbus Register 342: Name SDM2 Total Energy

Technical Definition

The register name SDM2 Total Energy at address 342 is used to monitor name sdm2 total energy on the Pana Relais I2C Ds18B20 Modbus V2.

• Protocol: Modbus RTU
• Data Type: FP32
• Unit: kWh
• 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 name SDM2 Total Energy (Address: 342)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=342, 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: "name SDM2 Total Energy"
  address: 342
  value_type: FP32
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Pana Relais I2C Ds18B20 Modbus V2]

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

💡 Engineer's Insight

Analysis: SDM2 total accumulated energy. Units are Kilowatt-hours (kWh). Tracks energy consumption over time.

Troubleshooting: Zero value suggests recent reset, no consumption, or sensor malfunction. Verify previous readings and device status.