CABLE VGA (pour ma culture perso)
Dernière réponse : dans Matériel
Salut à tous,
J'ai constaté récemment que le câble VGA (neuf) qui relie ma carte video au moniteur ne comportait que 14 broches sur les 15 qu'il est censé avoir.
Pourtant, je n'ai constaté aucune anomalie au niveau des couleurs à l'écran. Comment cela se fait-il ?
J'ai constaté récemment que le câble VGA (neuf) qui relie ma carte video au moniteur ne comportait que 14 broches sur les 15 qu'il est censé avoir.
Pourtant, je n'ai constaté aucune anomalie au niveau des couleurs à l'écran. Comment cela se fait-il ?
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La réponse est simple, il y a des PINs inutilisés : le 9 et le 15; le 9 étant physiquement absent sur tous les connecteurs VGA que j'ai pu voir. Ce n'est donc pas un défaut.
Pour ta culture personnelle, voici le détail:
IBM PC "VGA" and "SVGA" video cards have the following electrical interface:
Connector: 15 pin small "D" connector
Signal Name Pin Number Notes
-----------------------------------------------------------------------
RED video 1 Analog signal, around 0.7 volt, peak-to-peak to 75 ohm
GREEN video 2 Analog signal, sround 0.7 volt, peak-to-peak to 75 ohm
BLUE video 3 Analog signal, around 0.7 volt, peak-to-peak to 75 ohm
Monitor ID #2 4 (see note1):
Digital Ground 5 General "Ground" for the video system.
RED ground 6 \ Note that the video signals have a separate
GREEN ground 7 | ground path. This is needed any time you
BLUE ground 8 / get the pixel rate much over 20 or 30 MHz...
which is just about always.
KEY 9 (Not used)
SYNC ground 10 TTL return for the SYNC lines.
Monitor ID #0 11 (see note1)
Monitor ID #1 12 (see note1)
Horizontal Sync 13 Digital levels (0 to 5 volts, TTL output)
Vertical Sync 14 Digital levels (0 to 5 volts, TTL output)
Not Connected 15 (Not used)
The signal levels in RED, GREEN and BLUE signal are 0.7V peak to peak video signals terminated to 75 ohm load in video card and monitor ends. All other signals are TTL level signal (around 0..0.7V means logic 0 and 3..5V means logic 1).
Note1: Used by PC video cards to determine what type of monitor is connected to the graphics card. "Multi-Frequency" or "Multi-Sync", and the range of frequencies that the monitor can handle. Nowadays those signals are quite much replaced with the Plug and Play monitor signals.
Pour ta culture personnelle, voici le détail:
IBM PC "VGA" and "SVGA" video cards have the following electrical interface:
Connector: 15 pin small "D" connector
Signal Name Pin Number Notes
-----------------------------------------------------------------------
RED video 1 Analog signal, around 0.7 volt, peak-to-peak to 75 ohm
GREEN video 2 Analog signal, sround 0.7 volt, peak-to-peak to 75 ohm
BLUE video 3 Analog signal, around 0.7 volt, peak-to-peak to 75 ohm
Monitor ID #2 4 (see note1):
Digital Ground 5 General "Ground" for the video system.
RED ground 6 \ Note that the video signals have a separate
GREEN ground 7 | ground path. This is needed any time you
BLUE ground 8 / get the pixel rate much over 20 or 30 MHz...
which is just about always.
KEY 9 (Not used)
SYNC ground 10 TTL return for the SYNC lines.
Monitor ID #0 11 (see note1)
Monitor ID #1 12 (see note1)
Horizontal Sync 13 Digital levels (0 to 5 volts, TTL output)
Vertical Sync 14 Digital levels (0 to 5 volts, TTL output)
Not Connected 15 (Not used)
The signal levels in RED, GREEN and BLUE signal are 0.7V peak to peak video signals terminated to 75 ohm load in video card and monitor ends. All other signals are TTL level signal (around 0..0.7V means logic 0 and 3..5V means logic 1).
Note1: Used by PC video cards to determine what type of monitor is connected to the graphics card. "Multi-Frequency" or "Multi-Sync", and the range of frequencies that the monitor can handle. Nowadays those signals are quite much replaced with the Plug and Play monitor signals.
Certain de ces pins correspondent au DCDI "ou DCC" qui rend en fait le moniteur "Plug an Play" , c'est a dire ke le moniteur est capable d'envoyer à la CG les résolutions et fréquence auquels il fonctionne , de meme sur certaines marques , comme Mistubishi et LG , ont peut faires les réglages de géométries direcetement par windows , tout simplemetn a la souris ![:D]( ":D")
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