Jk Rs485 Bms11 Modbus Register 4702: Bms11 cell 11 wire resistance

Technical Definition

The register bms11 cell 11 wire resistance at address 4702 is used to monitor bms11 cell 11 wire resistance on the Jk Rs485 Bms11.

• 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 bms11 cell 11 wire resistance (Address: 4702)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4702, 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: "bms11 cell 11 wire resistance"
  address: 4702
  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[Jk Rs485 Bms11]

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

💡 Engineer's Insight

Analysis: Measures the internal resistance of BMS cell 11 in milliohms (mΩ). Important for maintaining battery pack balance and safety.

Troubleshooting: Zero suggests sensor malfunction, short circuit, or data acquisition error. High resistance implies cell degradation or connection fault.