User Guide

CHAPTER 2 HARDWARE INSTALLATION
2-23
2.8 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)