Fränkische Profi Air

Use cases

• Monitor supply and exhaust air temperatures on a live cloud dashboard to verify heat recovery performance.
• Create an alert when the filter remaining life drops below a set number of days to schedule timely maintenance.
• Remotely adjust the ventilation level from 0 to 4 based on occupancy or seasonal requirements.
• Track fan speeds over time to detect performance degradation or mechanical issues early.
• Provide end customers with a shared dashboard showing real-time indoor air quality parameters.
• Compare outside intake and indoor supply temperatures to evaluate heat exchanger efficiency.

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the same local network as the Fränkische Profi Air unit via Ethernet.
2. 2Verify the IP address of the Profi Air unit and ensure Modbus TCP communication is enabled on the device.
3. 3In the ModbusCloud portal, add a new device and import the Fränkische Profi Air template from the template library.
4. 4Enter the IP address and Modbus TCP port of the Profi Air unit in the gateway configuration.
5. 5Confirm that temperature readings (float32), filter remaining life (uint16), and ventilation level registers (uint32) are returning valid data on the dashboard.
6. 6Test the ventilation level write registers IO324 and IO325 by setting a level and verifying the fan speed changes on the unit.

Things to watch for

01

Why do the temperature values appear as zero or nonsensical numbers?

Temperature registers on the Fränkische Profi Air use the float32 data type, which requires reading two consecutive 16-bit registers. Ensure the template is configured for float32 and that the correct byte order (big-endian or little-endian) matches the device. Check the Profi Air documentation for the expected byte order.

02

What is the difference between registers IO324 and IO325 for ventilation level control?

The Profi Air exposes two separate write registers for setting the ventilation level. Both accept uint32 values from 0 to 4. Consult the Fränkische documentation to determine which register applies to your specific control scenario or firmware version.

03

The gateway cannot reach the Profi Air unit over the network. What should I check?

Confirm that both the gateway and the Profi Air are on the same subnet and that no firewall or VLAN is blocking Modbus TCP traffic on the configured port (default is 502). Verify the IP address is correct and that the unit is powered on.

04

How often is the filter remaining life value updated?

The filter remaining term register (uint16, in days) is updated by the Profi Air firmware periodically. It does not change in real time but decrements based on operating hours. Polling it once every few minutes is sufficient.

Registers (10)

8 read / 2 write

More TCP templates

Domekt R 400 V

Komfovent

Modbus TCP

Controls Komfovent Domekt recuperator ventilation via Modbus TCP

25 registers118

Fronius - Modbus TCP

Fronius

Modbus TCP

Monitors Fronius Symo and Primo inverters via Modbus TCP

15 registers597

NIBE Nibe S-Series (SG Ready)

NIBE

Modbus TCP

5 registers1

SunSpec Model 709 — DER Trip LF

SunSpec

Modbus TCP

9 registers

Victron Meter AcOut

Victron

Modbus TCP

16 registers

FoxESS Avocado (grid)

FoxESS

Modbus TCP

8 registers