What interface is d-sub?

d-sub is an analog signal or digital signal interface; d-sub only describes the connection structure, and does not define the entire interface or the functions of all pins. The most common ones are DB25 and DE9, which are used on personal computers. Typical applications are VGA, parallel port, and COM serial port.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

VGA terminal (Video Graphics Array (VGA) connector), other names include RGB terminal, D-sub 15, or mini D15, is a DE-15 with 3 rows of 15 pins. VGA terminals are usually found on computer graphics cards, monitors and other devices. It is used to send analog signals.

D-sub only describes the connection structure and does not define the entire interface or the functions of all pins. The most common ones are DB25 and DE9. Typical applications on personal computers are VGA (DA15 female), parallel port (DB25 female), and COM serial port (DE9 male). These interfaces are being used by DVI, HDMI, RJ45 Ethernet ports and USB replaced. DE9 was misunderstood as DB9 after the popularity of personal computers. Over time, DB9 became an alias for DE9. The same is true for D-sub with other pin numbers. Nowadays, relatively more people call it DB.

DA-15

VGA, using D-Sub 15 interface, with a total of 15 pinholes, divided into three rows, each Rank five. Due to design and manufacturing reasons, CRT color displays can only accept analog signal input. The most basic ones include the five components of RGBHV (red, green, blue, row, field, respectively). No matter what type of interface is used to connect, the The signal contains at least the above five components. The most common interface for most PC graphics cards is D-15, which is a D-shaped three-row 15-pin socket. Some of them are useless, and the signal lines used for connection are also vacant. In addition to these five essential components, the most important thing is that the DDC data component was added to the color display after 1996, which is used to read the color display brand, model, production date, and serial number recorded in the display EPROM. Number, indicator parameters and other information content to realize the PnP (Plug and Play) function required by WINDOWS. Almost all CRTs have this interface.

The VGA terminal (other names include D-sub 15, or mini D15) is a DE-15 with 3 rows of 15 pins. VGA terminals are usually found on computer graphics cards, monitors and other devices. It is used to transmit analog signals.

Generally speaking, pin 9 is not connected, but for newer models that support DDC1, pin 9 will be used, so older monitors will not operate properly.

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