Dell Inspiron 4000 Service Manual page 13

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Ports and Connector Pin-Outs
Dell™ Inspiron™ 4000
Port Locations
Serial Connector
Parallel Connector
Docking Connector
PS/2 Connector
USB Connector
Video Connector
S-Video TV-Out Connector
Port Locations
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
1 DCD
2 RXDA
3 TXDA
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Shell N/A
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
I/O Definition
I Data carrier detect
I Receive data
O Transmit data
O Data terminal ready
N/A Signal ground
I Data set ready
O Request to send
I Clear to send
I Ring indicator
N/A Frame ground