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CHAPTER 2
2.10 Serial Port Connectors: COM A and COM B
The mainboard provides two 9-pin male DIN connectors for serial port COM
A & COM B. 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.
Serial Port (9-pin Male)
PIN DEFINITION
PIN
1
2
3
4
5
6
7
8
9
HARDWARE INSTALLATION
1 2 3 4 5
6 7 8 9
COM B
COM A
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)
2-15
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