SYS-ITX-N-3900/Configuration
v1.0
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Page 16
8.3.6 VGA Connector (J8)
Standard full size 15-pin VGA connector.
8.3.7 RS232/422/485 Connector (J10)
This DB9 connector provides access to the SYS-ITX-N-3900 serial port
(RS232/422/485) at J10. This DB9 connector provides a serial port
connection and is switched by BIOS.
Layout and Pin Reference
8.3.8 M.2 key E Socket (J11)
The SYS-ITX-N-3900 provides a 2230 M.2 key E Socket to support a variety
of peripherals as available in this format.
8.3.9 Battery Connector (J15)
An optional external battery, connected to J15, supplies the SYS-ITX-N-
3900 board with standby power for the real-time clock and CMOS setup
RAM.
A power supervisory circuit contains the voltage sensing circuit and an
internal power switch to route the battery or standby voltage to the
circuits selected for backup. The battery automatically switches on when
the V
CC
of the systems drops below the battery voltage and off when V
CC
returns to normal.
Pin
RS232
RS422
RS485
1
DCD#
T-
RX/TX-
2
RXD#
T+
RX/TX+
3
TXD#
R+
N/A
4
DTR#
R-
N/A
5
GND
GND
GND
6
DSR#
N/A
N/A
7
RTS#
N/A
N/A
8
CTS#
N/A
N/A
9
RI#
N/A
N/A
10
N/A
N/A
N/A
6
9
5
1
