Schwörer fresh-air heater
Monitors and controls Schwörer fresh-air heater ventilation systems via Modbus RTU.
Modbus RTU template for the Schwörer fresh-air heater. Reads operating mode, air levels, temperatures, filter status, and error messages. Allows control of ventilation mode, target temperature, heating/cooling pump, and error reset.
- Protocol
- Modbus RTU
- Connection
- RS485, 19200 baud
- Registers
- 25, read and write
- Brand
- Schwörer Haus
- Key readings
- Operating mode and current air level · Target temperature room 1 · Heating-cooling function · Error message and emergency mode · Filter dirty status · Remaining time device and prelocated filter
- Available commands
- Operating mode and manual air level · Target temperature room 1 · Heating/cooling pump control · Error reset
- Last updated
Registers (25)
23 read, 9 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| 100 - operating mode | Read and write | ||||
| 102 - current air level | Read | ||||
| 101 - manual air level | Stufe | Read and write | |||
| 932 - target temperature room 1 | °C | Read and write | |||
| 948 - auxiliary heater enable room 1 | Read and write | ||||
| 230 - heating-cooling function | Read and write | ||||
| 231 - heating pump - heating | Read and write | ||||
| 232 - heating pump - cooling | Read and write | ||||
| 240 - error message | Read | ||||
| 253 - emergency mode | Read | ||||
| 242 - pressure monitor active | Read | ||||
| 243 - EVU locker active | Read | ||||
| 244 - door open | Read | ||||
| 245 - device filter dirty | Read | ||||
| 246 - prelocated filter dirty | Read | ||||
| 247 - low fare off | Read | ||||
| 248 - powersupply off | Read | ||||
| 250 - Pressostat activated | Read | ||||
| 251 - EVU locker extern active | Read | ||||
| 252 - heating module test operation active | Read | ||||
| 254 - air intake too cold | Read | ||||
| 265 - remaining time device filter | — | Read | |||
| 263 - remaining time prelocated filter | — | Read | |||
| 900 - current temperature room 1 | °C | Write | |||
| 241 - Error Reset | Write |
Loading registers…
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If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Monitor operating mode, air level, and target temperature on a live cloud dashboard for each building.
- Create an alert when the filter dirty flag activates so you can schedule a replacement visit.
- Remotely reset error codes to restore ventilation without dispatching a technician.
- Track remaining filter lifetime and device operation hours to plan preventive maintenance.
- Adjust target room temperature and heating or cooling mode remotely during seasonal transitions.
- Detect emergency mode activation and send instant notifications to the responsible installer.
Installation
Connect the ModbusCloud Gateway to the Schwörer fresh-air heater via a shielded RS-485 cable, observing correct A, B, and GND terminal assignments.
Set the Modbus slave address on the fresh-air heater to match the address configured in the ModbusCloud template.
Configure the gateway serial port to 19200 baud, odd parity (parity setting 1), and 8 data bits.
Import the Schwörer fresh-air heater template from the ModbusCloud library into your gateway project.
Verify communication by reading the operating mode and current air level registers on the ModbusCloud dashboard.
If room temperature feedback is needed, confirm that register 900 is configured as a write register supplying the measured room temperature to the heater.
Things to watch for
Communication fails after wiring. What should I check first?
Verify that the baud rate is set to 19200 and parity is set to odd (1). A mismatch in parity is the most common cause of failed communication with this unit.
Can I read and write the same register?
Yes. Registers 100, 101, 230, 231, 232, 932, and 948 are dual-purpose. The template handles both read and write operations on these registers.
What is register 900 used for?
Register 900 is write-only. It sends the current room temperature measurement to the heater so the unit can regulate its output. You need an external temperature sensor value written to this register.
How do I know when the filter needs replacement?
The template reads the filter dirty status flag and the remaining filter time register. Set up a ModbusCloud alert on the filter dirty flag to receive a notification automatically.
More Schwörer Haus templates
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