The DB25 (originally DE-25) connector is an analog 25-pin plug of the D-Subminiature connector family (D-Sub or Sub-D). The D-subminiature or D-sub is a common type of electrical connector used particularly in computers. A D-sub contains two or more parallel rows of pins or sockets usually surrounded by a D-shaped metal shield. The part containing pin contacts is called the male connector or plug, while that containing socket contacts is called the female connector or socket.

The DB25 is mainly used for serial connections, allowing for the asynchronous transmission of data as provided by standard RS-232 (RS-232C). It is also used for parallel port connections, and was originally used to connect printers, and as a result is sometimes known as a "printer port" (LPT for short). DB25 serial ports on computer generally have male connectors, while parallel port connectors are DB25 female plugs.

DB25 Pinout Connector Schematic Diagram

Assignment (parallel connection)

Pin# Description Pin# Description

1
2
3
4
5
6
7
8
9
10
11
12
13

STR – Strobe
D0 – Data bit 0
D1 – Data bit 1
D2 – Data bit 2
D3 – Data bit 3
D4 – Data bit 4
D5 – Data bit 5
D6 – Data bit 6
D7 – Data bit 7
ACK – Acknowledgement
Busy
Paper Out
Select

14
15
16
17
18
19
20
21
22
23
24
25

Auto feed
Error
Reset
Select Input
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground

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