U-Match/RAC Gree
Controls Gree U-Match and RAC air conditioning units via Modbus RTU.
This template integrates Gree U-Match and RAC air conditioning units via Modbus RTU. It provides monitoring of ambient and outdoor temperatures, unit status, and active mode. It also allows control of on/off, mode, fan speed, temperature setpoint, swing, and sleep mode.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 11, read and write
- Brand
- Gree
- Key readings
- Ambient temperature · Outdoor ambient temperature · Unit On/Off status · Set mode · Set fan speed · Set temperature
- Available commands
- Unit On/Off · Set mode and fan speed · Set temperature · Swing and sleep mode
- Compatible models
- U-Match · RAC
- Last updated
Registers (11)
11 read, 9 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Unit On_Off | Read and write | ||||
| Ambient temp | ℃ | Read | |||
| Set mode | Read and write | ||||
| Set fan speed | Read and write | ||||
| Set temp | ℃ | Read and write | |||
| Up & down swing | Read and write | ||||
| Left & right swing | Read and write | ||||
| Sleep mode | Read and write | ||||
| Temp lower limit for energy saving under cooling | ℃ | Read and write | |||
| Temp upper limit for energy saving under heating | ℃ | Read and write | |||
| Outdoor ambient temp | ℃ | Read |
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Use cases
- Monitor ambient and outdoor temperatures of Gree AC units on a live cloud dashboard.
- Remotely adjust temperature setpoints and operating modes without visiting the site.
- Create alerts when ambient temperature deviates from the setpoint by more than a defined threshold.
- Schedule on/off commands and sleep mode activation for energy savings during unoccupied hours.
- Track fan speed and swing settings across multiple Gree units in a single building overview.
Installation
For RAC models, install and wire the XK76 unit controller to the indoor unit before connecting Modbus RTU cabling.
Connect the Modbus RTU A and B lines from the Gree unit (or XK76 controller) to the RS-485 port on your ModbusCloud Gateway.
Set the baud rate on the gateway to 9600 to match the Gree default Modbus RTU configuration.
Assign a unique Modbus slave address on each Gree unit and ensure it matches the address configured in the ModbusCloud template.
Import the Gree U-Match/RAC template in the ModbusCloud platform and map it to the corresponding gateway and slave address.
Verify communication by checking that ambient temperature and unit status values appear correctly on the dashboard.
Things to watch for
Do I need additional hardware to connect RAC units via Modbus RTU?
Yes. RAC models require an XK76 unit controller to expose the Modbus RTU interface. Without this controller, the unit does not have an accessible RS-485 connection.
Why are my temperature readings showing incorrect or very large values?
Ambient and outdoor ambient temperature registers use int16 format, while all other registers use uint16. Make sure the data type is set to int16 for temperature registers in your configuration. Incorrect data type settings will produce wrong readings.
What baud rate should I use for the Modbus RTU connection?
The default baud rate for Gree U-Match and RAC units is 9600. Ensure both the gateway and the AC unit are set to the same baud rate, parity, and stop bit configuration.
Can I control multiple Gree units from one gateway?
Yes. Connect all units on the same RS-485 bus with unique slave addresses. Each unit gets its own template instance in ModbusCloud mapped to its specific address.
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