Asus RS726Q-E7/RS12 - Manual (Page 66)

4-14 Chapter 4: Motherboard information
7. ASMB6 header (ASMB6)
The ASMB6 connector on the motherboard supports an ASUS ® Server
Management Board 6 Series.
8. Thermal sensor cable connectors (3-pin TR1, TR2)
These connectors are for temperature monitoring. Connect
the thermal sensor cables to these connectors and place the
other ends to the devices, which you want to monitor temperature.
Please go to BIOS setup to change the default setting of TR1/TR2 from “disabled“
to “enabled“ before using the thermal sensor cable.