Asus Z9PH-D16 - Manual (Page 48)

2-30 Chapter 2: Hardware information
10. TPM connector (20-1 pin TPM)
This connector supports a Trusted Platform Module (TPM) system, which can
securely store keys, digital certificates, passwords, and data. A TPM system
also helps enhance network security, protects digital identities, and ensures
platform integrity.
9. 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.