Jkbms Modbus Modbus Register 4680: JKBMS max voltage cell

Technical Definition

The register JKBMS max voltage cell at address 4680 is used to monitor jkbms max voltage cell on the Jkbms Modbus.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit:
• 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 JKBMS max voltage cell (Address: 4680)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4680, 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: "JKBMS max voltage cell"
  address: 4680
  value_type: U_WORD
  unit_of_measurement: ""

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Jkbms Modbus]

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

💡 Engineer's Insight

Analysis: JKBMS max voltage cell (V). The highest voltage reading among all individual cells in the battery pack.

Troubleshooting: Abnormally high values suggest a faulty cell or overcharging. Zero could signal a communication issue or an error state.