Esp32 Jk Pb Modbus Example Modbus Register 4680: Name max voltage cell number

Technical Definition

The register name max voltage cell number at address 4680 is used to monitor name max voltage cell number on the Esp32 Jk Pb Modbus Example.

• 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 name max voltage cell number (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: "name max voltage cell number"
  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[Esp32 Jk Pb Modbus Example]

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

💡 Engineer's Insight

Analysis: Maximum voltage setting for a single battery cell in millivolts (mV). Indicates safe upper voltage limit.

Troubleshooting: Unexpectedly high value might indicate a configuration error. Low value could limit battery performance.