User`s manual

PICO121 AMD G-Series Embedded SoC Pico-ITX Board
AX93278 I/O Board (Optional) 99
COM1
COM2
A.6.4 USB 3.0 Connector (CN5)
The board comes with a Universal Serial Bus (compliant with USB 3.0 (5Gb/s))
connector on the rear I/O for installing USB peripherals such as keyboard, mouse,
scanner, etc.
A.6.5 COM Connector (CN6)
CN6 is a double-deck DB-9 connector for COM1 (lower) and COM2 (upper). COM1
comes with power capability on DCD and RI pins by setting jumpers (see section A.5.1).
The pin assignments of RS-232/RS-422/RS-485 are listed in table below. If you need
COM1 port to support RS-422 or RS-485, please refer to BIOS setting in section 6.4.
COM1:
COM2:
Pin
Signal
Pin
Signal
1
USB_VCC (+5V level
standby power)
10
USB_VCC (+5V level
standby power)
2
USB_Data0-
11
USB_Data1-
3
USB_Data0+
12
USB_Data1+
4
GND
13
GND
5
SSRX0-
14
SSRX1-
6
SSRX0+
15
SSRX1+
7
GND
16
GND
8
SSTX0-
17
SSTX1-
9
SSTX0+
18
SSTX1+
Pin
RS-232
RS-422
RS-485
10
DCD
TX-
Data-
11
RXD
TX+
Data+
12
TXD
RX+
N.C
13
DTR
RX-
N.C.
14
GND
No use
No use
15
DSR
No use
No use
16
RTS
No use
No use
17
CTS
No use
No use
18
RI
No use
No use
Pin
Signal
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI