DFI HU171 - Manual (Page 12)

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12
Chapter 2 Hardware Installation
Chapter 2
Auto Power-on Select
JP25 is used to select the method of powering on the system. If you want the system to
power-on whenever AC power comes in, set JP25 pins 2 and 3 to On. If you want to use the
power button, set pins 1 and 2 to On.
When using the JP25 “Power On” feature to power the system back on after a power failure
occurs, the system may not power on if the power lost is resumed within 5 seconds (power
flicker).
JP11, JP15, JP27, JP28, JP30 and JP31 are used to select the power of the USB ports. Select-
ing +5V_standby will allow you to use a USB device to wake up the system.
USB Power Select
Important:
1. If you are using the Wake-On-USB Keyboard/Mouse function for 2 USB ports, the
+5V_standby power source of your power supply must support ≥1.5A. For 3 or
more USB ports, the +5V_standby power source of your power supply must support
≥2A.
2. JP11 will work when USB 5 is populated on the system board.
1-2 On:
Power-on via power button
(default)
2-3 On:
Power-on via AC power
1 3 2 1 3 2
2-3 On:
+5V_standby
1-2 On: +5V
(default)
1
3
2
1
3
2
1-2 On: +5V
(default)
2-3 On:
+5V_standby
1
3
2
1
3
2
JP25
USB HUB
1-2 (JP31)
USB 0-1
(JP15)
USB HUB
3-4 (JP27)
USB HUB
5-6 (JP28)
USB 2-3
(JP30)
USB 5
(JP11)