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Chapter 4: Motherboard Connections
VGA Port
One VGA port is located next to COM Port 1 on the I/O back panel. Use this connection for
VGA display.
Serial Port
There is one COM port (COM1) on the I/O back panel on the motherboard. This COM port
provides serial communication support. See the table below for pin definitions.
COM Port
Pin Definitions
Pin#
Definition
Pin#
Definition
1
DCD
6
DSR
2
RXD
7
RTS
3
TXD
8
CTS
4
DTR
9
RI
5
Ground
10
N/A
Back Panel USB (3.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
VBUS
10
Power
2
D-
11
USB 2.0 Differential Pair
3
D+
12
4
Ground
13
Ground of PWR Return
5
StdA_SSRX-
14
SuperSpeed Receiver
6
St 15
Differential Pair
7
GND_DRAIN
16
Ground for Signal Return
8
StdA_SSTX-
17
SuperSpeed Transmitter
9
St
18
Differential Pair
Universal Serial Bus (USB) Ports
There are two USB 3.0 ports (USB0/USB1) located on the I/O back panel. The motherboard
also has a front access USB 3.0 header that supports two USB connections (USB3/USB4). A
USB Type A header (USB2), located next to GPU PWR2, provides also USB 3.0 support. The
onboard headers can be used to provide front side USB access with a cable (not included).
Front Panel USB (3.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
VBUS
19
Power
2
Stda_SSRX-
18
USB3_RN
3
St 17
USB3_RP
4
Ground
16
Ground
5
Stda_SSTX-
15
USB3_TN
6
St 14
USB3_TP
7
Ground
13
Ground
8
D-
12
USB_N
9
D+
11
USB_P
10
x
