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Chapter 1
Connectivity
The serial port 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
port.
Signal
DCD
Data Carrier Detect
RX
TX
DTR
Data Terminal Ready
GND
DSR
RTS
Request to Send
CTS
RI
Name
Receive Data
Transmit Data
Signal Ground
Data Set Ready
Clear to Send
Ring Indicator
1-27
Motherboard Description
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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