Dell Inspiron 4150 User Manual page 78

Pin Assignments for I/O Connectors: Dell Inspiron 4150
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
2 RXDA I
3 TXDA O
4 DTR O
5 GND N/A Signal ground
6 DSR I
7 RTS O
8 CTS I
9 RI I
Shell N/A N/A Frame ground
Parallel Connector
Use the 25-hole parallel connector to attach a parallel device to the computer. The
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Data carrier detect
Receive data
Transmit data
Data terminal ready
Data set ready
Request to send
Clear to send
Ring indicator