VGA (VESA DDC)

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  • VGA = Video Graphics Adapter or Video Graphics Array
  • VESA = Video Electronics Standards Association
  • DDC = Display Data Channel

Videotype: Analogue.

15 PIN HIGHDENSITY D-SUB FEMALE 15 PIN HIGHDENSITY D-SUB FEMALE at the videocard

15 PIN HIGHDENSITY D-SUB MALE 15 PIN HIGHDENSITY D-SUB MALE at the monitor cable

Pin Name Dir Description
1 RED OUT Red Video (75 ohm, 0.7 V p-p)
2 GREEN OUT Green Video (75 ohm, 0.7 V p-p)
3 BLUE OUT Blue Video (75 ohm, 0.7 V p-p)
4 RES - Reserved
5 GND —— Ground
6 RGND —— Red Ground
7 GGND —— Green Ground
8 BGND —— Blue Ground
9 +5V OUT +5 VDC
10 SGND —— Sync Ground
11 ID0 IN Monitor ID Bit 0 (optional)
12 SDA IN/OUT DDC Serial Data Line
13 HSYNC or CSYNC OUT Horizontal Sync (or Composite Sync)
14 VSYNC OUT Vertical Sync
15 SCL IN/OUT DDC Data Clock Line

Notes

  • Direction is Computer relative Monitor
  • There are 3 different protocols defined for DDC:
    • DDC1 - A unidirectional (display to host only) serial comm system which provides basic display ID and feature support information (including supported timings, display size, colorimetry and gamma, etc.) to the host. This uses pin 12 on the 15-pin “VGA” connector as a data line.
    • DDC2B - Adds clock (pin 15) and return (pin 11) to enable at least ID information to be obtained via an I2C interface. I2C is a bidirectional interface, but display control via DDC2B is not defined at this time.
    • DDC2AB - Full ID and control of the monitor via ACCESS.bus. As ACCESS.bus is basically a command and protocol definition on top of the I2C hardware interface, this uses the same lines as DDC2B.

References

Category:Computer Video Connectors

 

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