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D-shaped connectors, also known as Centronics connectors, are a type of connector commonly used for data communication and telecommunications connections. These connectors were popularized by computer peripherals such as printers and modems and are still widely used in those applications today. The D-shaped connectors were originally developed by Centronics Corporation and are often referred to simply as “Centronics connectors.”

A D-shaped connector is made up of two parts, both of which are named the same. These parts have a “D” shape with two distinct pins on opposite sides. The two parts are designed to mate together and create a secure electrical connection when they are inserted into one another. The connectors are designed to ensure a reliable connection that is resistant to electromagnetic interference (EMI), as well as giving a positive click when two parts are mated together.

The most common type of D-shaped connector is the Centronics 36-pin variant, which is used in most printers, modems, and many other devices. This version contains 36 pins in two rows, each of which is spaced distinctively to ensure that they are not confused with similar connectors. The 36-pin connector is used for parallel communication protocols such as IEEE 1284 and is widely used for transferring data from hosts to peripherals. The 36-pin version is also backward-compatible with many legacy formats, making it a popular choice when connecting legacy devices to new systems.

In addition to the 36-pin Centronics connector, there are several other variations of D-shaped connectors that are used for various applications. These include the 15-pin and 25-pin connectors, which are used in modems, scanners, and other computer peripherals. These two versions contain the same type of pins as the 36-pin version, but in a more compact format and fewer pins. The 15-pin version is most commonly used for serial communication protocols such as RS-232, and the 25-pin version is most commonly used for parallel communication protocols such as IEEE 1284.

The D-shaped connectors are designed to ensure minimal interference and a secure connection, and they have become a popular choice for transferring data from host to peripheral devices. The 36-pin version is the most common type of connector and is used for transferring large amounts of data in parallel communication protocols. There are also several other versions of the D-shaped connector, including the 15-pin and 25-pin versions, which are used for serial and parallel communication protocols, respectively. With their reliable connections and compatibility with legacy devices, the D-shaped connectors are a popular choice for device connectivity in many applications.

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