Jkbms Modbus Modbus Register 4756: JKBMS power

Technical Definition

The register JKBMS power at address 4756 is used to monitor jkbms power on the Jkbms Modbus.

• Protocol: Modbus RTU
• Data Type: S DWORD
• Unit: W
• 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 power (Address: 4756)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4756, 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 power"
  address: 4756
  value_type: S_DWORD
  unit_of_measurement: "W"

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: Real-time power consumption or generation. Units: Watts (W). Positive for charging, negative for discharging.

Troubleshooting: Zero power during operation suggests no load connected or no charging source active. Verify load and charger status.