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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
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
DCD
Data Carrier Detect
RX
TX
DTR
Data Terminal Ready
GND
DSR
RTS
CTS
RI
Name
Receive Data
Transmit Data
Signal Ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
DB9 PIN
DB25 PIN
1
8
2
3
3
2
4
20
5
7
6
6
7
4
8
5
9
22
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