CHAPTER 2
HARDWARE INSTALLATION
2-18
2.9 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.
PIN
SIGNAL
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)
PIN DEFINITION
1 2 3 4 5
6 7 8 9
COM A
Serial Port (9-pin Male)
COM B