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B550M/ac
2.6 Onboard Headers and Connectors
System Panel Header
(9-pin PANEL1)
(see p.1, No. 12)
Connect the power
button, reset button and
system status indicator on
the chassis to this header
according to the pin
assignments below. Note
the positive and negative
pins before connecting
the cables.
GND
R ESET#
PWRBTN#
PLED-
PLED+
GND
HDLED-
HDLED+
1
GND
Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over these
headers and connectors. Placing jumper caps over the headers and connectors will cause
permanent damage to the motherboard.
PWRBTN (Power Button):
Connect to the power button on the chassis front panel. You may congure the way to turn
o your system using the power button.
RESET (Reset Button):
Connect to the reset button on the chassis front panel. Press the reset button to restart the
computer if the computer freezes and fails to perform a normal restart.
PLED (System Power LED):
Connect to the power status indicator on the chassis front panel. e LED is on when the
system is operating. e LED keeps blinking when the system is in S1/S3 sleep state. e
LED is o when the system is in S4 sleep state or powered o (S5).
HDLED (Hard Drive Activity LED):
Connect to the hard drive activity LED on the chassis front panel. e LED is on when the
hard drive is reading or writing data.
e front panel design may dier by chassis. A front panel module mainly consists of power
button, reset button, power LED, hard drive activity LED, speaker and etc. When connect-
ing your chassis front panel module to this header, make sure the wire assignments and the
pin assignments are matched correctly.
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