Mainboard Features
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6-3.
Serial and Parallel Interface Ports
This system comes equipped with one serial port and one parallel port.
Both types of interface ports will be explained in this chapter.
6-3-1. The Serial Interface: JCOM1/ JCOM2
The serial interface port is sometimes referred to as an RS-232 port or
an asynchronous communication port. Mice, printers, modems and
other peripheral devices can be connected to a serial port. The serial
port can also be used to connect your computer with another computer
system.
Connectivity
The serial ports can be used in many ways, and it may be necessary to
become familiar with the pinout diagram. The following chart gives you
the function of each pin on the 9-pin connector and some of the 25-pin
connector. This information can be used when configuring certain
software programs to work with the serial ports.
Signal
Name
DB9 PIN
DB25 PIN
DCD Data
Carrier
Detect 1
8
RX Receive
Data 2
3
TX Transmit
Data 3
2
DTR Data
Terminal
Ready 4
20
GND Signal
Ground 5
7
DSR Data
Set
Ready 6
6
RTS Request
to
Send 7
4
CTS Clear
to
Send 8
5
RI Ring
Indicator 9
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