B550D4-4L
22 23
English
2.7 Onboard Headers and Connectors
System Panel Header
(9-pi n PANEL1)
(see p.6, No. 20)
GND
RESET#
PWRBTN#
PLED-
PLED+
GND
HDLED-
HDLED+
1
GND
Connect the power switch,
reset switch and system status
indicator on the chassis to this
header according to the pin
assignments. Particularly note
the positive and negative pins
before connecting the cables.
PWRBTN (Power Switch):
Connect to the power switch on the chassis front panel. You may congure the way to turn
o your system using the power switch.
RESET (Reset Switch):
Connect to the reset switch on the chassis front panel. Press the reset switch 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 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
switch, reset switch, 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.
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.
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