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VGA connector
From Wikipedia, the free encyclopedia
| VGA connector (DE-15/HD-15) | ||
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| Type | Analogue computer video connector | |
| Production history | ||
| Designer | IBM based on D-subminiature | |
| Designed | 1987 | |
| Produced | 1987 to present | |
| Superseded by | DVI (1999) | |
| Specifications | ||
| Video signal | RGB video signal plus option H and V sync | |
| Data signal | I²C data channel for DDC information | |
| Pins | 15 | |
| Connector | DE-15 | |
| Pin out | ||
 A female DE15 socket (videocard side). |
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| Pin 1 | RED | Red video |
| Pin 2 | GREEN | Green video |
| Pin 3 | BLUE | Blue video |
| Pin 4 | N/C | Not connected |
| Pin 5 | GND | Ground (HSync) |
| Pin 6 | RED_RTN | Red return |
| Pin 7 | GREEN_RTN | Green return |
| Pin 8 | BLUE_RTN | Blue return |
| Pin 9 | +5 V | +5 V DC |
| Pin 10 | GND | Ground (VSync, DDC) |
| Pin 11 | N/C | Not connected |
| Pin 12 | SDA | I²C data |
| Pin 13 | HSync | Horizontal sync |
| Pin 14 | VSync | Vertical sync |
| Pin 15 | SCL | I²C clock |
| The image and table details the newer 15-pin VESA DDC2 connector. Note that the pin numbering in the diagram is a female connector at the graphics adapter; the pin numbering on the male connector, usually the cable end, is the mirror image. | ||
A VGA connector as it is commonly known (other names include RGB connector, D-sub 15, mini sub D15 and mini D15) is a three-row 15 pin DE-15. There are four versions: original and DDC2 pinouts, the far older and less flexible DE-9 connector, and a Mini-VGA used for laptops.
The common 15-pin VGA connector found on most video cards, computer monitors, and other devices, is almost universally called "HD-15". HD stands for "high-density", which distinguishes it from connectors having the same form factor but only 2 rows of pins. However, this connector is often incorrectly referred to as a DB-15 or HDB-15.[citation needed]
"VGA connectors" and their associated cabling are always used solely to carry analog component RGBHV (red - green - blue - horizontal sync - vertical sync) video signals along with DDC2 digital clock and data.
Where size is a constraint (such as laptops) a mini-VGA port can sometimes be found in place of the full-sized VGA connector.
[edit] Disabling DDC
On Microsoft Windows (Versions XP and above), there is no software provided option to disable plug and play monitor detection. This causes problems with computer/monitor switching applications and causes computer games to select display resolutions higher than the monitor is physically capable of displaying resulting in a garbled display.
In these circumstances, it may be necessary to remove pin 12 from the monitor VGA cable, to disable plug and play monitor detection. This allows display resolution to be selected manually and not overridden when the display adapter is removed and reinserted or the KVM switch is operated.
The automatic plug-and-play monitor detection under Windows operating systems can be overridden in the video card's control panel when the appropriate third-party driver is installed.
[edit] See also
- Video Graphics Array (VGA)
- Digital Visual Interface (DVI)
- Display Data Channel (DDC/DDC2)
- Video Electronics Standards Association (VESA)
- Extended display identification data (EDID)
- Super Video Graphics Array (SVGA)
- D-Terminal
- Component video
[edit] External links
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