Serial connector, Parallel connector – Dell Inspiron 7500 User Manual
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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.
Pin Assignments 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 port
sends and receives data in parallel format, where 8 data bits (one byte) are sent simultaneously over 8 separate lines.
The parallel port 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 port 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 serial connector.
Pin Assignments 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
PD0
I/O
Printer data bit 0
3
PD1
I/O
Printer data bit 1
4
PD2
I/O
Printer data bit 2
5
PD3
I/O
Printer data bit 3
6
PD4
I/O
Printer data bit 4
7
PD5
I/O
Printer data bit 5
8
PD6
I/O
Printer data bit 6
9
PD7
I/O
Printer data bit 7
10
ACK#
I
Acknowledge