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VGA (VESA DDC) Pinout

VGA=Video Graphics adapter or Video Graphics Array. VESA=Video Electronics Standards Association. DDC=Display Data Channel.

Pin Name Dir Description
1 RED --> Red Video (75 ohm, 0.7 V p-p)
2 GREEN --> Green Video (75 ohm, 0.7 V p-p)
3 BLUE --> 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 --> +5 VDC
10 SGND --- Sync Ground
11 ID0 <-- Monitor ID Bit 0 (optional)
12 SDA <-> DDC Serial Data Line
13 HSYNC or CSYNC --> Horizontal Sync (or Composite Sync)
14 VSYNC --> Vertical Sync
15 SCL <-> DDC Data Clock Line

NOTE: 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.