Esp32 Jk Pb Modbus Example Modbus Register 4172: Name charge OTP

Technical Definition

The register name charge OTP at address 4172 is used to monitor name charge otp on the Esp32 Jk Pb Modbus Example.

• Protocol: Modbus RTU
• Data Type: S DWORD
• 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 name charge OTP (Address: 4172)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4172, 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 charge OTP"
  address: 4172
  value_type: S_DWORD
  unit_of_measurement: "°C"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp32 Jk Pb Modbus Example]

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

💡 Engineer's Insight

Analysis: Charge Over-Temperature Protection threshold. Units: Degrees Celsius (°C). Sets the maximum battery Temperature for charging.

Troubleshooting: Zero value could be a fault or incomplete initialization. Ensure the sensor is functional and the value is set correctly.