Bms Combine Modbus Client Modbus Register 23: Max Temperature

Technical Definition

The register Max Temperature at address 23 is used to monitor max Temperature on the Bms Combine Modbus Client.

• Protocol: Modbus RTU
• Data Type: S WORD
• Unit: °C
• 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 Max temperature (Address: 23)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=23, 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: "Max temperature"
  address: 23
  value_type: S_WORD
  unit_of_measurement: "°C"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Bms Combine Modbus Client]

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

💡 Engineer's Insight

Analysis: Indicates the maximum recorded Temperature within the system, likely in degrees Celsius or Fahrenheit. Essential for preventing overheating.

Troubleshooting: A value of 0 may signify a sensor issue, a lack of Temperature data, or a system reset if the reading is abnormal.