Pack Modbus Register 30: Friendly name pack Cell Voltage 16

Technical Definition

The register friendly name pack Cell Voltage 16 at address 30 is used to monitor friendly name pack cell voltage 16 on the Pack.

• 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 friendly_name pack Cell Voltage 16 (Address: 30)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=30, 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: "friendly_name pack Cell Voltage 16"
  address: 30
  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[Pack]

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

💡 Engineer's Insight

Analysis: Voltage of Cell 16 within the battery pack, typically measured in Volts (V). Final cell voltage reading for pack monitoring and safety.

Troubleshooting: Investigate: compromised cell, broken wire, sensor failure, or communication loss with the control system.