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CHAPTER 2
Serial Port Connectors: COM A and COM B
The mainboard provides two 9-pin male DIN connectors for serial port COM
A. These port are 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
Note:
9
GND
RI
8
7
DTR
5
SOUT
CTS
6
4
3
SIN
RTS
1
DCD
DSR
2
COM B
1 2 3 4 5
6 7 8 9
COM A
Serial Port (9-pin Male)
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)
There is another serial port connector (COM B),
which is located on the mainboard. Connect a
serial port 9 pin male port into this connector.
2-14
HARDWARE INSTALLATION
SIGN
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