Chapter 2 – DFI HD171-H81 User Manual
Page 16
www.dfi .com
16
Chapter 2 Hardware Installation
Chapter 2
JP2, JP3, JP8 and JP9 are used to select the power of the USB ports. Selecting +5V_standby
will allow you to use a USB device to wake up the system.
USB Power Select
Important:
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.
1
3
2
1
3
2
2-3 On:
+5V_standby
1-2 On: +5V
(default)
1-2 On: +5V
(default)
2-3 On:
+5V_standby
1
3
2
1
3
2
USB 3.0 1-2
(JP3)
USB 8-9/11
(JP8)
USB 4-5
(JP9)
USB 2.0 2-3
(JP2)
COM 2 RS422/485 Select
2
1
9
RXD-
RXD+
TXD+
TXD-
NC.
NC.
NC.
NC.
NC.
2
1
9
DATA-
DATA+
TXD
NC.
NC.
NC.
NC.
NC.
NC.
1
3
2
4
3-4 On: RS485
1-2 On: RS422
(default)
1
3
2
4
JP6 is used to configure the COM port 2 to RS422 or RS485. The pin functions of the COM
port will vary according to the jumper’s setting.
JP6
COM 2:
RS422/485
JP6
COM 2
1
3
2
4
2
1
9