Device Jkpb0116 Modbus Register 4678: Name bms name cell delta voltage

Technical Definition

The register name bms name cell delta voltage at address 4678 is used to monitor name bms name cell delta voltage on the Device Jkpb0116.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: V
• 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_bms_name_cell_delta_voltage (Address: 4678)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4678, 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_bms_name_cell_delta_voltage"
  address: 4678
  value_type: U_WORD
  unit_of_measurement: "V"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Device Jkpb0116]

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

💡 Engineer's Insight

Analysis: Cell delta voltage (V). Represents the difference between the highest and lowest cell voltages in the battery pack. Monitors cell balance.

Troubleshooting: Zero indicates all cells have equal voltage. High values suggest cell imbalance requiring investigation of individual cell health.