17) com (serial port header) – GIGABYTE Z790 UD AC LGA 1700 ATX Motherboard User Manual
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16) F_USB1/F_USB2 (USB 2.0/1.1 Headers)
The headers conform to USB 2.0/1.1 specification. Each USB header can provide two USB ports via an
optional USB bracket. For purchasing the optional USB bracket, please contact the local dealer.
Pin No.
Definition
1
Power (5V)
2
Power (5V)
3
USB DX-
4
USB DY-
5
USB DX+
6
USB DY+
7
GND
8
GND
9
No Pin
10
NC
DEBUG
PORT
G.QBOFM
10
9
2
1
Prior to installing the USB bracket, be sure to turn off your computer and unplug the power cord
from the power outlet to prevent damage to the USB bracket.
10
9
2
1
17) COM (Serial Port Header)
The COM header can provide one serial port via an optional COM port cable. For purchasing the optional
COM port cable, please contact the local dealer.
Pin No.
Definition
1
NDCD-
2
NSIN
3
NSOUT
4
NDTR-
5
GND
6
NDSR-
7
NRTS-
8
NCTS-
9
NRI-
10
No Pin