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# ASUS ROG Ryuo I 240 Liquid Cooler Protocol
The data of all USB packets is 65 bytes long and prefixed with `0xEC`.
## Generic Operations
### Get firmware version
- Request:
- Header: `0xEC 0x82`
- Response:
- Header: `0xEC 0x02`
- Data:
- Byte 2–18: firmware-version (ASCII)
## Cooling Operations
### Set fixed fan speed
- Request:
- Header: `0xEC 0x2A`
- Data:
- Byte 2: Fan duty % from `0x00` to `0x64` (0–100%)
- Response:
- None
## Notes
- Only the `"fans"`/`"fan"` channel is supported as of this driver.
- No real-time status or telemetry (e.g. fan RPM, temperature) is available for this device as of this driver.
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