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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.