D-Subminiature or D-sub is a common type of electrical connector. They are named their own D-shaped metal shields. When introduced, D-subs is one of the smallest connectors used in a computer system. DB25 is one of the variants of the D-Sub connector.
Name Origin of DB25
D-sub connectors are usually described by the total number of pins that they can hold. In some cases, the DB25 connector can only load 4 or 5 pins; however, it is still called a “DB25” connector instead of “DB4” or “DB5”. Another example is the HD15 connector used by the monitor – most display cables are only 14 pins, but are still called HD15 connectors. DB-xx is the name of a series of port connectors used to connect the device to a computer. DB-xx connectors include DB-9, DB-15, DB-25, DB-50 and DB-68.
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What is DB 25
The DB-25 is a public connector for connecting external modems and RS-232 serial peripherals on older IBM-compatible computers. The DB-25 female connector is the parallel port connector for most personal computers. DB-25 for the first time with the original IBM personal computer (PC) with the use of long life.
The female DB-25 has been widely used in the past for printer ports on PCs (see printer cables). When the serial port is popular, the male DB-25 is also the second serial port (COM2) on the PC. It is still widely used in RS-232 communication equipment.
Usage of DB25
The DB25 (originally DE-25) connector is an analog 25-pin plug of the D-Subminiature connector family (D-Sub or Sub-D).
Like the DB9 connector, the DB25 is primarily used for serial connections, allowing asynchronous transmission of data provided by standard RS-232 (RS-232C).
It is also used for parallel port connections, initially used to connect printers, and is sometimes referred to as “printer port” (LPT).
So in order to avoid confusion, the DB25 serial port on the computer usually has a public connector, parallel port connector is DB25 female connector.
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