.Quatt Sniffer Hp2 Modbus Register 2107: HP2 - Electric Expansion Valve

Technical Definition

The register HP2 - Electric Expansion Valve at address 2107 is used to monitor hp2 - electric expansion valve on the .Quatt Sniffer Hp2.

• Protocol: Modbus RTU
• Data Type: INT16
• Unit: p
• 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 HP2 - Electric Expansion Valve (Address: 2107)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=2107, 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: "HP2 - Electric Expansion Valve"
  address: 2107
  value_type: INT16
  unit_of_measurement: "p"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[.Quatt Sniffer Hp2]

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

💡 Engineer's Insight

Analysis: Reflects the current position or status of the HP2 electric expansion valve. Units are typically steps or a percentage.

Troubleshooting: A zero value might indicate the valve is fully closed or unresponsive. Check for obstructions or control system faults.