Realtime Modbus Register 12556: Prefix RT: Load Voltage

Technical Definition

The register prefix RT: Load Voltage at address 12556 is used to monitor prefix rt: load voltage on the Realtime.

• 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 prefix RT: Load Voltage (Address: 12556)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=12556, 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: "prefix RT: Load Voltage"
  address: 12556
  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[Realtime]

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

💡 Engineer's Insight

Analysis: Voltage supplied to the connected load. Units: Volts (V).

Troubleshooting: Ensure load power supply is active and stable. Check wiring and load health if voltage is absent.