Asus Z9PH-D16 - Manual (Page 49)

ASUS Z9PH-D16, Z9PH-D16/FDR 2-31
11. Power Supply SMBus connector (6-1 pin PSUSMB1)
This connector allows you to connect SMBus (System Management Bus) to
the power supply unit to read PSU information. Devices communicate with an
SMBus host and/or other SMBus devices using the SMBus interface.
BMC_SYNC
12C1SCL_PB
GND
PSU_ALERT#
12C1SDA_PB