Srne Modbus Register 266: Name load dc charging status

Technical Definition

The register name load dc charging status at address 266 is used to monitor name load dc charging status on the Srne.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit:
• 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_load_dc_charging_status (Address: 266)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=266, 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_load_dc_charging_status"
  address: 266
  value_type: U_WORD
  unit_of_measurement: ""

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Srne]

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

💡 Engineer's Insight

Analysis: Load DC charging status. Indicates if the load is currently receiving power from DC sources (e.g., battery).

Troubleshooting: Zero value may mean no power available, load disconnected, or a fault in the power path.