Tone Air Modbus Register 110: Volume restant ECS

Technical Definition

The register Volume restant ECS at address 110 is used to monitor volume restant ecs on the Tone Air.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: L
• 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 Volume restant ECS (Address: 110)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=110, 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: "Volume restant ECS"
  address: 110
  value_type: U_WORD
  unit_of_measurement: "L"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Tone Air]

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

💡 Engineer's Insight

Analysis: Remaining Domestic Hot Water (DHW) volume. Indicates available hot water capacity.

Troubleshooting: If 0, hot water tank is depleted. If reading is stuck, check level sensor or pump.