SCART

SCART (from Syndicat des Constructeurs d'Appareils RadiorŽcepteurs et
TŽlŽviseurs) is a standard for connecting audio and video equipment. Also
called Peritel and Euroconnector.

The SCART connector was developed by the French. It's original purpose was
to prevent foreign television imports. Previously France had legislation
which prevented all imported televisions, if they didn't support the old
French 819 line monochrome system. One could understand that this stopped
effectively any foreign televisions of being imported, but when the 819 line
system disappeared this happened not to be a valid reason for banning
imports. So they introduced the SCART socket to try and maintain their
private television market, the new passed legislation said every TV sold in
France since 1980 must have a SCART socket. This was of course much less of
a deterrent, it was much easier for manufacturers to add a SCART socket to
their televisions than to produce dual-standard sets, and the SCART was
actually useful elsewhere with the development of cheap home video
recorders.

Before SCART, many video and audio devices provided lots of different
sockets for AV signals. Devices made by different companies could have
different and incompatible standards!

SCART attempts to make connecting such devices together much simpler, by
providing one plug that contains all the necessary signals, and is standard
across different manufacturers. SCART makes connecting such devices very
simple, because one cable can connect any two SCART-compatible devices, and
the connector is designed so that you cannot insert it incorrectly.

Pin-out:

 +------------------------------------------+
 | 1   3   5   7   9   11  13  15  17  19   | 21
 |                                          \
 |   2   4   6   8   10  12  14  16  18  20  \
 +--------------------------------------------+

  1. AUDIO Output Right
  2. AUDIO Input Right
  3. AUDIO Output Left
  4. AUDIO Ground
  5. BLUE Ground
  6. AUDIO Input Left
  7. BLUE
  8. Function Switching
  9. GREEN Ground
 10. D²B Input
 11. GREEN
 12. D²B Output
 13. RED/Chroma Ground
 14. D²B Ground
 15. RED/Chroma
 16. Blanking
 17. VIDEO/Sync/Luminance Ground
 18. Blanking Ground
 19. VIDEO/Sync/Luminance Output
 20. VIDEO/Sync/Luminance Input
 21. Common Ground (metal shield)

Pin 8 is a signal from the source that indicates the type of video present.

     0V means no signal, or internal bypass
     +6V means a widescreen (16:9) signal
     +12V means a normal (4:3) signal

D²B (Digital Data Bus) is an IEC standard for a serial communication
bus. It is a multi-master bus for home automation, and was originally
developed by Philips in the 1970s.

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