Aaeon SBC-551 Manual page 40

The SBC-551/552 provides a connector for CPU cooling fan.
Fan power connector
Pin
1
2
3
The USB connector supports two universal serial ports. This
connector allows an optional external adaptor and attached cable to
connect external USB devices. If the USB ports are installed, the
USB setting in the CMOS setup should be set to Enabled. The
USB ports also require operating system supporting for USB
devices.
The SBC-551/552 CPU card has one USB Connector ( support two
USB channels), their connection pin assignment is as follows.
Pin
1
3
5
7
9
32 SBC-551/552 User Manual
Signal
+12 V
FAN_ON
+5V
Signal
VCC
-DATA0
+DATA0
GND
NC
Pin Signal
2
4
6
8
10
VCC
-DATA1
+DATA1
GND
NC