I2c is a bidirectional interface but display control via ddc2b is not defined at this time.
Pinout vga cable wiring diagram 15 pin.
In the original version of de 15 pinout one pin was keyed by plugging the female connector hole.
This uses pin 12 on the 15 pin vga connector as a data line.
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15 pin highdensity d sub male at the monitor cable.
The image and below table are the newer 15 pin vga vesa ddc2 connector pinout.
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This prevented non vga 15 pin cables from being plugged into a vga socket.
There are at least four versions of the vga connector which are the three row 15 pin de 15 also called mini sub d15 in original and ddc2 pinouts a less featureful and far less common 9 pin vga and a mini vga used for laptops.
Vga ddc2 connector pinout.
Ddc2b adds clock pin 15 and return pin 11 to enable at least id information to be obtained via an i2c interface.
A pin not actually connected to anything or left out entirely.
There are some vga ports where pin 14 is not used.
Likewise there are some vga cables where the 14th pin is a dead pin.
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If your equipment needs the full 15 pin set up or you want to keep your bases covered make sure to purchase a true 15 pin cable.