1 Reply Latest reply: Oct 26, 2011 9:04 AM by Doc_SilverCreek RSS

S5520HC - HDD Led Activity header ?

bipsen Community Member
Currently Being Moderated



I don't know if anyone in here will be able to answer... I have bought a S5520HC serverboard, and I will have to connect an Adaptec 3405 RAID controller.


The S5520HC board has an input-header/connector for add-in card HDD activity LED - designation MM according to the technical product specification page 6/7.


My problem is that I don't have a cable, that will fit between my controller and the mainboard, so I will have to make it myself (not the real issue, I'm an electronics engineer).... But there is no description of the pinout of the connector - whar is + and - (anode and cathode)... And since no further information is available (whether the signal is transmitted via an optocoupler), I don't know if I risk damaging something, if the polarity is swicthed...


Can anyone help me ?




  • 1. Re: S5520HC - HDD Led Activity header ?
    Doc_SilverCreek Community Member
    Currently Being Moderated

    Wow. Your right . TPS really dropped the ball on that one



    Pin 1 (closest to rear of board) is the input for the HDD Activity LED.with a 4.7k pull-up to 3.3v.

    Pin 2 is "No connect".




    Adaptec 3405 http://download.adaptec.com/pdfs/user_guides/adaptec_raid_controller_iug_8_2010.pdf   pg 136

    Pin Number               Signal                                   Description

    2                     AGGREGATE4_7_L                      Aggregate Cathode - Connector J5 Ports 0-3

    1                    +3.3V                                             Aggregate Anode





    Pin 1 on the MB to Pin 2 on the raid card pulls the LED_SCSI_N low to activite the LED.

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