Chenbro RM418 Series 6Gb/s 24-port 2.5 Expander Backplane(80H10341802A0, 80H10341803A0, 80H17341801A0), For 24-bay 2.5 Hot-swap HDD Cage - Manual - Manual (Page 13)

SW1 Function Definition
SW1-1: FAN Quantity Setting
Sw1-1 FAN
ON 4
OFF 3
SW1-2: PWM Enable/Disable Setting
Sw1-2 PWM
ON Enable
OFF Disable
SW1-3: TEMP Threshold Setting
Sw1-3 TEMP
ON 65℃
OFF 55℃
SW1-4: FAN Enable/Disable Setting
Sw1-4 FAN
ON Enable
OFF Disable
SW1-5: BUZZER Enable/Disable Setting
Sw1-5 BUZZER
ON Enable
OFF Disable
SW1-6: SES Enable/Disable Setting
Sw1-6 SES
ON Enable
OFF Disable