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# ASUS Ryujin II liquid cooler protocol
The data of all usb packets is 65 bytes long, prefixed with `0xEC`.
## Generic Operations
### Get firmware info
- Request:
- Header: `0xEC 0x82`
- Response:
- Header: `0xEC 0x02`
- Data:
- Byte 4-18: Firmware version (ascii)
## Cooling Operations
### Get cooling info
- Request:
- Header: `0xEC 0x99`
- Response:
- Header: `0xEC 0x19`
- Data:
- Byte 4: Liquid temperature (integer digits)
- Byte 5: Liquid temperature (decimal digit)
- Byte 6-7: Pump rpm (little endian)
- Byte 8-9: Embedded Micro Fan rpm (little endian)
### Get duties of pump and of embedded micro fan
- Request:
- Header: `0xEC 0x9A`
- Response:
- Header: `0xEC 0x1A`
- Data:
- Byte 5: Pump duty % from 0x00 to 0x64
- Byte 6: Embedded Micro Fan duty % from 0x00 to 0x64
### Get fan speed of AIO fan controller
- Request:
- Header: `0xEC 0xA0`
- Response:
- Header: `0xEC 0x20`
- Data:
- Byte 4-5: Fan 4 rpm (little endian)
- Byte 6-7: Fan 1 rpm (little endian)
- Byte 8-9: Fan 2 rpm (little endian)
- Byte 10-11: Fan 3 rpm (little endian)
### Get duty of AIO fan controller
- Request:
- Header: `0xEC 0xA1`
- Response:
- Header: `0xEC 0x21`
- Data:
- Byte 5: AIO fan controller duty from 0x00 to 0xFF
### Set duties of pump and of embedded micro fan
- Request:
- Header: `0xEC 0x1A`
- Data:
- Byte 4: Pump duty % from 0x00 to 0x64
- Byte 5: Embedded Micro Fan duty % from 0x00 to 0x64
- Response:
- Header: `0xEC 0x1A`
### Set duty of AIO fan controller
- Request:
- Header: `0xEC 0x21`
- Data:
- Byte 5: AIO fan controller duty from 0x00 to 0xFF
- Response:
- Header: `0xEC 0x21`
## Unknown
- Request:
- Header: `0xEC 0xAF`
- Response:
- Header: `0xEC 0x2F`
- Byte 4-17: ?
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