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Chapter 1
1.7.3.2 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
Data Set Ready
RTS
Request to Send
CTS
RI
Name
DB9 PIN
Receive Data
Transmit Data
Signal Ground
Clear to Send
Ring Indicator
1-26
Motherboard Description
DB25 PIN
1
8
2
3
3
2
4
20
5
7
6
6
7
4
8
5
9
22
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