Résolution carte NI 9234

Bonjour,
J'ai une carte NI9234 que j'utilise pour acquérir une sinusoide entre (-200mV; 200mV)
J'utilise pour acquérir mes échantillons, la fonction DAQmxReadBinaryI32. Pourriez vous me dire comment sont organisées les données dans le buffer de lecture ?
Les 24bits que je lis (Résolution de la carte) sont ils bit de poid fort à gauche ou à droite ?
J'utilise la fonction DAQmxCreateAIVoltageChan pour créer ma voie de lecture. Quelle min et max je doit mêttre pour avoir la résolution la plus précise ?, Comment cela influence les données que je lis ?
Merci d'avance pour vos réponses,
Cordialement,
Stéphane

Bonjour,
En réalité, le 9234 ne possède pas de buffer, c'est plutot le chassis l'utilisant (cDAQ, USB/ETH 1 slot etc) qui en possède un.
Maintenant, il n'y a pas vraiment d'utilité de savoir comment chaque bit est placé, DAQmx retourne les valeurs directement interprétable.
Maintenant si vous voulez récupérer du RAW (la valeur sur un I32, I16 par ex.) il faudra comme je l'ai dit, reconvertir les valeurs dans la gamme voulu.
Cad par exemple pour un +=5V la valeur maximale relative du I32 = 5V et la valeur minimale négative du I32 = -5V.
Ou alors vous pouvez aussi récupérer la valeur directement convertie sur un float via DAQmxReadAnalogF64 par exemple.
Dans tous les cas, il n'y a pas besoin de venir jouer avec les octets/bits renvoyés.
Pour toutes autres précisions et exemples vous pourrez vous référer au manuel de référence C de DAQmx:
NI-DAQmx C Reference Help
http://digital.ni.com/manuals.nsf/websearch/6A79EF​4F9F30AFC086257A4400600861
Aussi, si ce n'est pas déjà fait, installer le support de DAQmx pour les langages textuels qui vient aussi installer des exemples C, .NET etc:
Installing NI-DAQmx Examples for LabWindows/CVI
http://digital.ni.com/public.nsf/allkb/BA4DF79463C​884BD86256E0B00813E1E?OpenDocument
que vous retrouverez alors ici:
Location of ANSI C NI-DAQmx Shipping Examples and DAQmx Library File for Windows
http://digital.ni.com/public.nsf/allkb/FB26BDA52FF​FD4EE86257124005C36C3
Vous trouverez facilement des exemples d'acquisition prêt à l'emploi, qui vous aiderons à démarrer.
Cdlt
Victor F. | Application Engineer
Certified LabVIEW Developer | Certified TestStand Architect
National Instruments France

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    [email protected]
    www.ni.com/mcm
    www.ni.com/soundandvibration
    www.ni.com/biganalogdata
    512-683-5444

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