Can not reach Exos X16 SAS with A2SDI-H-TF through CS381 backplate

[GPSLeo]

I have a Supermicro A2SDI-H-TF mainboard in a SilverStone CS381 case. This case has backplates for SAS or SATA drives. The backplate is connected to the mainboard with a SFF-8643 to SFF-8643 cable.

But I do not get any connection to my Seagate Exos X16 SAS drives.

Putting in a SATA drive instead a SAS drive does work.

Am I doing something wrong or is the backplate broken?

 

[GPSLeo]

One point I forgot to mention: The "drive connected" lamp of the backplate lights up.(And "in use" lamp blinks a bit on startup.)

 

[GPSLeo]

I found the problem: The mainboard has Mini SAS connectors but they are only connected to a SATA interface and the backplate does not has a adapter included.