Rv Batt Sg5K Modbus Register 57357: Over discharge voltage

Technical Definition

The register Over discharge voltage at address 57357 is used to monitor over discharge voltage on the Rv Batt Sg5K.

• 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 Over discharge voltage (Address: 57357)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=57357, 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: "Over discharge voltage"
  address: 57357
  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[Rv Batt Sg5K]

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

💡 Engineer's Insight

Analysis: Indicates the minimum safe operating voltage (Volts) for the battery. Below this, discharge must stop to prevent damage.

Troubleshooting: If the system reads this value as 0 or is incorrect, it could signify a battery issue or sensor fault. Check battery health and connections.