Asus V2-PE3 - Manual (Page 60)

4-10 Chapter 4: Motherboard info
10. Serial port connector (10-1 pin COM2)
This connector is for a serial (COM) port. Connect the serial port
module cable to this connector, then install the module to a slot
opening at the back of the system chassis.
COM Port Connector
®
PIN 1
COM2
11 IEEE 1394 port (10-1 pin IE1394_1)
This connector is for a IEEE 1394 port. Connect the IEEE 1394 module
cable to this connector, then install the module to a slot opening at
the back of the system chassis. (optional)
IEEE 1394 Connector
®
IE1394_1
TPA2- GND TPB2- +12V GND
TPA2+
GND
+12V
1
TPB2+
Never connect a USB cable to the IEEE 1394 connector. Doing so will
damage the motherboard!