Chapter1 Motherboard Description
1-25
Connectivity
The serial port can be used many ways, and it may be necessary to become
familiar with the pin-out 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 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 22
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