Asus RS100-E8-PI2 - Manual (Page 66)

Chapter 4: Motherboard information 4-14
7. Serial General Purpose Input/Output connector (6-1 pin SGPIO1)
The SGPIO 1 connectors are used for the Intel ® Rapid Storage Technology Enterprise
SGPIO interface that manages LED pattern generation, device information, and general
purpose data.
6. Thermal sensor cable connectors (3-pin TR1)
This connector allows you to connect a Thermal sensor cable that is used for temperature
monitoring. Connect the Thermal sensor cable to the connector and place its probe to the
device that you want to check the temperature.