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Ports and Connector Pin-Outs: Dell Inspiron 4100
Serial Connector
Use the 9-pin serial connector to attach a serial device to the computer. The serial connector passes
data in serial format (1 bit at a time over one line). This connector supports a variety of devices,
including a serial mouse, that require serial data transmission. If you reconfigure your hardware, you
may need pin number and signal information for the serial connector.
Pin Signal I/O Definition
1 DCD I Data carrier detect
2 RXDA I Receive data
3 TXDA O Transmit data
4 DTR O Data terminal ready
5 GND N/A Signal ground
6 DSR I Data set ready
7 RTS O Request to send
8 CTS I Clear to send
9 RI I Ring indicator
Shell N/A N/A Frame ground
Parallel Connector
Use the 25-hole parallel connector to attach a parallel device to the computer. The parallel connector is
used primarily for printers. The parallel connector transmits data in parallel format, where 8 data bits
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