Asus Z9NH-D12 - Manual (Page 56)

2-34 Chapter 2: Hardware information
7. Serial General Purpose Input/Output connectors
(8-1 pin ISGPIO1, SGPIO1)
The SGPIO 1 connectors are used for the Intel Rapid Storage Technology
Enterprise SGPIO interface that controls the LED pattern generation, device
information and general purpose data.
• The ISGPIO 1 connector is for SATA connectors-ISAS connectors.