Asus TUF GAMING B550-PLUS WIFI II Manual page 15

13. COM Port header
This header is for a serial (COM) port. Connect the serial port module cable
to this header, then install the module to a slot opening at the back of the
system chassis.
14. Front Panel Audio header
This header is for a chassis-mounted front panel audio I/O module that
supports HD audio standard. Connect one end of the front panel audio
I/O module cable to this header.
• We recommend that you connect a high-definition front panel
audio module to this header to avail of the motherboard's high-
definition audio capability.
• If you want to connect a high-definition front panel audio
module to this header, set the Front Panel Type item in the
BIOS setup to [HD Audio]. By default, this header is set to [HD
Audio].
15. SPI TPM header
This header supports a Trusted Platform Module (TPM) system with a
Serial Peripheral Interface (SPI), allowing you to securely store keys, digital
certificates, passwords, and data. A TPM system also helps enhance
network security, protects digital identities, and ensures platform integrity.
The SPI_TPM module is purchased separately.
16. 20-5 pin System Panel header
This header supports several chassis-mounted functions.
• System power LED (2-pin PLED)
This 2-pin header is for the system power LED. Connect the
chassis power LED cable to this header. The system power LED
lights up when you turn on the system power, and blinks when the
system is in sleep mode.
• Hard disk drive activity LED (2-pin HDD_LED)
This 2-pin header is for the HDD Activity LED. Connect the HDD
Activity LED cable to this header. The HDD LED lights up or flashes when data is read
from or written to the HDD.
• System warning speaker (4-pin SPEAKER)
This 4-pin header is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
• ATX power button/soft-off button (2-pin PWRSW)
ASUS TUF GAMING B550-PLUS WIFI II
COM
PIN 1
AAFP
HD-audio-compliant
pin definition
PIN 1
TPM
PANEL
PLED SPEAKER
PWRSW
PIN 1
HDD_LED RESET PLED
* Requires an ATX power supply
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