Jkbms Modbus Modbus Register 4768: JKBMS alarms bitmask

Technical Definition

The register JKBMS alarms bitmask at address 4768 is used to monitor jkbms alarms bitmask on the Jkbms Modbus.

• Protocol: Modbus RTU
• Data Type: U DWORD
• 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 alarms bitmask (Address: 4768)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4768, 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 alarms bitmask"
  address: 4768
  value_type: U_DWORD
  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: Bitmask indicating active alarm conditions. Each bit represents a specific fault (e.g., overvoltage, undervoltage, temp).

Troubleshooting: A value of zero indicates no active alarms. Non-zero requires decoding the bitmask to identify specific faults.