MSI MS-5191 Manual page 25

The mainboard has a 9-pin male DIN connector for serial port COM A.
This port is a 16550A high speed communication port that send/receive 16
bytes FIFOs. You can attach a mouse or a modem cable directly into this
connector.
PIN DEFINITION
PIN
1
2
3
4
5
6
7
8
9
1 2 3 4
5
6 7 8 9
COM A
Serial Ports (9-pin Male)
SIGNAL
DCD(Data Carry Detect)
SIN(Serial In or Receive Data)
SOUT(Serial Out or Transmit Data)
DTR(Data Terminal Ready)
GND
DSR(Data Set Ready)
RTS(Request To Send)
CTS(Clear To Send)
RI(Ring Indicate)
2-20