The VGA monitor connector is a three-row DB-9/15 (also called mini sub D15) connector for use with a VGA, SVGA, or XGA monitor. Figure 3-4 shows the pin configuration and Table 3-9 lists the signals and pin assignments.
Figure 3-4 VGA monitor connector
The SDA and SCL signals use I2C protocols to transmit Extended Display Identification Data (EDID) from the display to the computer. The specifications for the SDA and SCL signals are included in the Display Data Channel (DDC) Standard published by the Video Electronics Standards Association (VESA). To obtain more information see Video Electronics Standards Association.