asus_ryujin.md

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: ?