Imars Mg5Ktl 2M Modbus Register 5806: DC Residual Current

Technical Definition

The register DC Residual Current at address 5806 is used to monitor dc residual current on the Imars Mg5Ktl 2M.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: mA
• 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 DC Residual Current (Address: 5806)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=5806, 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: "DC Residual Current"
  address: 5806
  value_type: U_WORD
  unit_of_measurement: "mA"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Imars Mg5Ktl 2M]

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

💡 Engineer's Insight

Analysis: DC residual current, indicating potential ground faults in DC circuits. Units: Amperes (A) or milliamps (mA).

Troubleshooting: Non-zero value points to DC grounding issues or faulty components. Inspect DC wiring and PV arrays.