.Quatt Sniffer Hp2 Modbus Register 2104: HP2 - Fan Speed Maximum

Technical Definition

The register HP2 - Fan Speed Maximum at address 2104 is used to monitor hp2 - fan speed maximum on the .Quatt Sniffer Hp2.

• Protocol: Modbus RTU
• Data Type: INT16
• Unit: RPM
• 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 - Fan Speed Maximum (Address: 2104)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=2104, 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 - Fan Speed Maximum"
  address: 2104
  value_type: INT16
  unit_of_measurement: "RPM"

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: Sets the maximum allowable operating speed for the HP2 fan. Units are typically Revolutions Per Minute (RPM) or a percentage.

Troubleshooting: This is usually a configuration parameter. A value of 0 might indicate a default or unconfigured state. Check device setup.