ONOKOM AIR HS-3-MB-B
Controls Hisense air conditioners via the ONOKOM HS-3-MB-B Modbus gateway.
This template connects Hisense air conditioners via the ONOKOM HS-3-MB-B gateway over Modbus RTU. It reads indoor and outdoor temperatures, humidity, and compressor power, and provides control of operating modes, fan speed, vanes, and target temperature.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 20, read and write
- Brand
- Onokom
- Key readings
- Indoor air temperature · Outdoor air temperature · Indoor and outdoor heat exchanger temperatures · Indoor humidity · Current and target compressor power
- Available commands
- Target temperature · modes · Fan speed and vanes · Eco, sleep, and quiet modes
- Compatible models
- ONOKOM HS-3-MB-B
- Last updated
Registers (20)
14 read, 12 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Indoor air temperature | °C | Read | |||
| Outdoor air temperature | °C | Read | |||
| AC connected | Read | ||||
| Screen light (Status) | Read and write | ||||
| Sleep mode (Status) | Read and write | ||||
| Eco mode (Status) | Read and write | ||||
| Indoor heat exchanger temperature | °C | Read | |||
| Outdoor heat exchanger temperature | °C | Read | |||
| Vertical vanes (Status) | Read and write | ||||
| Horizontal vanes | Read and write | ||||
| Quiet mode (Status) | Read and write | ||||
| Indoor humidity | % | Read | |||
| Current compressor power | % | Read | |||
| Target compressor power | W | Read | |||
| Active (Control) | Write | ||||
| Loxone modes (Control) | Write | ||||
| Smart fan speed | Write | ||||
| Target temperature | °C | Write | |||
| Modbus address | Write | ||||
| Vanes swing | Write |
Loading registers…
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Use cases
- Monitor indoor and outdoor temperatures of Hisense AC units on a live cloud dashboard for your customer.
- Create alerts when indoor humidity or compressor power exceeds predefined thresholds.
- Remotely adjust target temperature and operating mode for Hisense air conditioners across multiple sites.
- Log heat exchanger temperatures over time to detect efficiency degradation and schedule maintenance.
- Switch between eco, sleep, and quiet modes based on time schedules or occupancy data.
- Track compressor power consumption to verify energy performance against design specifications.
Installation
Wire the ONOKOM HS-3-MB-B gateway to the Hisense indoor unit following the manufacturer's wiring diagram.
Connect the RS-485 (A/B) terminals of the ONOKOM gateway to the RS-485 port on the ModbusCloud Gateway.
Set the Modbus slave address on the ONOKOM gateway and ensure the baud rate is configured to 9600.
Import the ONOKOM AIR HS-3-MB-B template in the ModbusCloud platform and assign it to the correct gateway and slave address.
Verify communication by checking that indoor temperature and humidity readings appear on the ModbusCloud dashboard.
Things to watch for
Why do I see incorrect values for outdoor temperature or quiet mode status?
Address 4 is shared between outdoor air temperature (read) and quiet mode status (read/write). Ensure the correct Modbus function code is used for each operation. The template handles this automatically, but custom polling configurations may cause conflicts.
What baud rate should I use for the ONOKOM HS-3-MB-B?
The default and recommended baud rate is 9600. Make sure both the ONOKOM gateway and the ModbusCloud gateway are set to the same baud rate, parity, and stop bit configuration.
Can I connect multiple Hisense AC units on the same RS-485 bus?
Yes, each ONOKOM HS-3-MB-B gateway must have a unique Modbus slave address. You can daisy-chain multiple gateways on the same RS-485 bus and create a separate template instance for each in ModbusCloud.
The ModbusCloud gateway does not receive any data from the ONOKOM device. What should I check?
Verify the RS-485 wiring polarity (A to A, B to B). Confirm that the slave address matches the address configured in the template. Check that the ONOKOM gateway is powered and properly connected to the Hisense indoor unit.
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