Esp32 Jk Pb Modbus Example Modbus Register 4730: Name cell 25 wire resistance

Technical Definition

The register name cell 25 wire resistance at address 4730 is used to monitor name cell 25 wire resistance on the Esp32 Jk Pb Modbus Example.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: Ω
• 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 cell 25 wire resistance (Address: 4730)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4730, 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 cell 25 wire resistance"
  address: 4730
  value_type: U_WORD
  unit_of_measurement: "Ω"

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: Measures the electrical resistance of the internal wiring for cell 25. Units are typically Ohms (Ω).

Troubleshooting: A value of 0 or very low may indicate a short circuit. High values suggest degraded or damaged wiring.