Asus RS260-E4/RX8 - Manual (Page 76)

4-12 Chapter 4: Motherboard information
3. Hard disk activity LED connector (4-pin HDLED1)
This connector is used to connect to a hard disk drive active LED connector
on the SCSI or RAID card.
®
DSBF-D12/2U/SAS storage card activity LED connector
HDLED1
PIN1
ADD_IN_CARD- NC NC ADD_IN_CARD-