Garo Reader Modbus Register 274: Energy Consumed Total

Technical Definition

The register Energy Consumed Total at address 274 is used to monitor energy consumed total on the Garo Reader.

• Protocol: Modbus RTU
• Data Type: S DWORD R
• 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 Energy Consumed Total (Address: 274)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=274, 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: "Energy Consumed Total"
  address: 274
  value_type: S_DWORD_R
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Garo Reader]

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

💡 Engineer's Insight

Analysis: Total energy consumed by the device since installation. Units are typically kWh or MWh.

Troubleshooting: Zero indicates no consumption or a communication error. Check power supply and Modbus connection.