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 11)

Fan Connector Pin Definition (JF1 ~ JF4)
Power Failure Connector Pin Definition (JC4)
Power Alarm Mute Connector Pin Definition (JC5)
RS232 Connector Pin Definition (JC1)
Fan Connector Pin Definition (JF5)
Pin
NO.
Descriptions
1 GND
2 12V
3 FAN Clock Input
4 FAN PWM Output
Pin
NO.
Descriptions
1 GND
2 Fail signal Input(Active Low)
Pin
NO.
Descriptions
1 MUTE -
2 MUTE +
Pin
NO.
Descriptions
1 GND
2 KEY PIN
3 RXD
4 TXD
Pin
NO.
Descriptions
1 GND
2 12V