My Inverter%203 2Kw Modbus Register 4521: Unknown4521

Technical Definition

The register Unknown4521 at address 4521 is used to monitor unknown4521 on the My Inverter%203 2Kw.

• 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 Unknown4521 (Address: 4521)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4521, 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: "Unknown4521"
  address: 4521
  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[My Inverter%203 2Kw]

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

💡 Engineer's Insight

Analysis: Likely a continuation of monitored values or a related control parameter. Its precise function is unknown without the device's register map.

Troubleshooting: If this value deviates from expected norms, it could indicate a component failure or a communication error. Review inverter logs and connections.