Asus F2A55-M LK2 PLUS - Manual (Page 39)

8. USB 2.0 connectors (10-1 pin USB56, USB78)
These connectors are for USB 2.0 ports. Connect the USB module cable to any of
these connectors, then install the module to a slot opening at the back of the system
chassis. These USB connectors comply with USB 2.0 specification that supports up to
480Mbps connection speed.
Never connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
The USB 2.0 module is purchased separately.
F2A55-M LK2 PLUS PIN 1
USB+5V USB_P8- USB_P8+ GND NC
USB+5V USB_P7- USB_P7+
GND
USB78
PIN 1
USB+5V USB_P6- USB_P6+ GND NC
USB+5V USB_P5- USB_P5+
GND
USB56
F2A55-M LK2 PLUS USB2.0 connectors
9. Serial port connector (10-1 pin COM)
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.
The COM module is purchased separately.
F2A55-M LK2 PLUS
F2A55-M LK2 PLUS Serial port (COM1) connector
PIN 1
COM1
DCD TXD GND RTS
RI
RXD DTR DSR CTS
ASUS F2A55-M LK2 Series 1-27