MSI MS-9A69-A1, Manual, Page: 12 / 72

1-4
Overview MS-9A69-U Series
1
WiFi Antenna Connector (Optional)
This connector allows you to connect an external antenna for wireless LAN.
2
RS232 Serial Port: COM3 ~ COM6
The serial port is a 16550A high speed communications port that sends/
receives 16 bytes FIFOs. It supports barcode scanners, barcode printers, bill
printers, credit card machine, etc.
1 5
6 9
RS232
PIN SIGNAL DESCRIPTION
1
2
3
4
5
6
7
8
9
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
POWER
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request To Send
Clear To Send
5V or 12V selected by GPIO (BIOS)