Asus KGPE-D16 User Manual page 54

9. Serial port connector (10-1 pin COM2)
This connector is for a serial (COM) port. Connect the serial port module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.
10. BMC header (BMC_FW1)
The BMC connector on the motherboard supports an ASUS
Management Board 4 Series (ASMB4).
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Chapter 2: Hardware information