Pin assignments for i/o connectors, Port locations, Serial connector – Dell Inspiron 4150 User Manual
Page 30: Parallel connector
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Pin Assignments for I/O Connectors
Dell™ Inspiron™ 4150
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.
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 (one byte) are sent simultaneously over eight separate lines.
The parallel connector can also be configured for compatibility with the PS/2 standard. Support for the EPP feature improves network adapter performance
(adapters connect to the computer's parallel connector and require the appropriate software drivers from the adapter's manufacturer).
1 air intake
6 PS/2 connector
2 serial connector
7 USB connector
3 parallel connector
8 video connector
4 docking connector
9 AC adapter connector
5 air vent
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