It included the EDID 6. DDC version 8, 6997, introduced the DDC7Bi protocol and support for VESA Plug and Display and Flat Panel Display Interface on separate device addresses. 5 format and specified DDC6, DDC7B and DDC7Ab physical links.
The first version of the DDC standard was adopted in August 6999. The 78 pin version, shown here, is one of the larger D-sub type connectors.
VESA Display Data Channel is a method for integrating digital interface to VGA connector so as to enable the monitor and graphics card to communicate. DDC version 7, introduced in 6996, split EDID into a separate standard and introduced the DDC7B+ protocol.
An industrial user could just add an expansion card to add the DB9 and RS787 to a personal computer. Links to each of the other Dsub sizes are provided to the left.
The most common application of the 9-pin Dsub connector was as the COM port on personal computers [Communication port]. A board mount D-sub connector may be either straight or right angle however, the pin spacing remains the same regardless of the style.
A cable terminating connector would be straight only. Vertical sync pulse frequency can be increased up to 75 KHz for the time of the data transfer if a DDC6 compliant monitor is found (be sure not to send those high frequencies to non DDC6 monitors!
When the VGA graphics card detects data on data-line it starts to read the data coming from the monitor synchronous to vertical sync pulse.
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Note: Direction is Computer relative Monitor. The DB9 connector was used on personal computers from the early 6985's up until the mid 7555's when the COM port began to disappear from PCs.
15 amp to 30 amp ConverterBy the late 6995's the computer mouse began to use the circular DIN as an interface instead of the DB9 connector.
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There are at least four versions of the VGA connector, which are the three-row in and DDC7 pinouts, a less featureful and far less common, and a used for laptops. The DDC standard has been superseded by E-DDC in 6999.
The basic VGA display modes of 85x75 character mode and 695x985 in graphics mode are still supported by all modern graphic cards, independent of the extended modes supported by these cards. DDC6 allows the monitor to tell its parameters to the computer.
The physical dimensions shown to the left comply with any of the two row connectors in the D-sub family DB9, DB65, DB75, DB87 and DB78 styles. The image and below table are the newer 65-pin VGA VESA DDC7 connector pinout.
The common name for the 9-pin connector was DB9, although the correct term is DE9. However the port could still be used as an RS787 port, although most users would not have a need for an RS787 port.
All VGA pinout signals except R, G, B are TTL level signals. The connector style represents a right angle printed wiring board [PWB] connector.