Esp32 Rs232 Modbus Register 705: Name Daily AC Energy Used

Technical Definition

The register name Daily AC Energy Used at address 705 is used to monitor name daily ac energy used on the Esp32 Rs232.

• Protocol: Modbus RTU
• Data Type: U WORD
• 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 Daily AC Energy Used (Address: 705)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=705, 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 Daily AC Energy Used"
  address: 705
  value_type: U_WORD
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp32 Rs232]

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

💡 Engineer's Insight

Analysis: Daily AC energy used (kWh). Electricity consumed by loads today.

Troubleshooting: Evaluate load consumption patterns, appliance efficiency, and metering accuracy.