Ports and connector pin-outs, Serial connector, Parallel connector – Dell Inspiron 2500 User Manual
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Ports and Connector Pin-Outs
Dell™ Inspiron™ 2500 Systems
Serial Connector
Use the 9-pin serial connector to attach a serial device to the computer. The serial port passes data in serial format (1 bit at a time over one line). This port
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).
If you reconfigure your hardware, you may need pin number and signal information for the parallel 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
Pin
Signal
I/O
Definition
1
STB#
I/O
Strobe
2
D0
I/O
Printer data bit 0
3
PD1
I/O
Printer data bit 1