MSI MS-9A69-U Series Manual page 12

Overview
1
WiFi Antenna Connector (Optional)
This connector allows you to connect an external antenna for wireless LAN.
RS232 Serial Port: COM3 ~ COM6
2
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.
RS232
PIN
1
2
3
4
5
6
7
8
9
1-4
SIGNAL DESCRIPTION
DCD Data Carrier Detect
RXD Receive Data
TXD Transmit Data
DTR Data Terminal Ready
GND Ground
DSR Data Set Ready
RTS Request To Send
CTS Clear To Send
POWER 5V or 12V selected by GPIO (BIOS)
1 5
6 9