Mosquito Trap 3 Modbus Register 12544: Name pv array input voltage

Technical Definition

The register name pv array input voltage at address 12544 is used to monitor name pv array input voltage on the Mosquito Trap 3.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: V
• 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_pv_array_input_voltage (Address: 12544)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=12544, 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_pv_array_input_voltage"
  address: 12544
  value_type: U_WORD
  unit_of_measurement: "V"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Mosquito Trap 3]

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

💡 Engineer's Insight

Analysis: PV Array Input Voltage (Volts). DC voltage generated by the solar panels.

Troubleshooting: Zero reading indicates no sunlight, panel fault, loose connection, or inverter issue.