Asus H81M2 - Manual (Page 25)

ASUS H81M2 1-17
7. USB 2.0 connectors (10-1 pin USB910, USB1112)
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 specifications and 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.
8. 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.
H81M2
H81M2 USB2.0 connectors
PIN 1
USB+5V USB_P11- USB_P11+ GND NC
USB+5V
USB_P12- USB_P12+
GND
USB1112 USB910
PIN 1
USB+5V USB_P9- USB_P9+ GND NC
USB+5V
USB_P10- USB_P10+
GND
H81M2
H81M2 Serial port connectors
PIN 1
COM
DCD TXD GND RTS
RI
RXD DTR DSR CTS