CHAPTER 2
HARDWARE INSTALLATION
2.13 Serial Port Connectors: COM A & COM B
The mainboard has two serial ports COMA and COMB. These two ports
are 16550A high speed communication ports that send/receive 16 bytes
FIFOs. You can attach a mouse or a modem cable directly into these
connectors.
PIN DEFINITION
Pin #
Definition
1
DCD(Data Carry Detect)
2
SIN(Serial In or Receive Data)
3
SOUT(Serial Out or Transmit Data)
4
DTR(Data Terminal Ready)
5
GND
6
DSR(Data Set Ready)
7
RTS(Request To Send)
8
CTS(Clear To Send)
9
RI(Ring Indicate)
1 2 3 4 5
6 7 8 9
COM A
COM B
Serial Ports (9-pin Male)
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