Pb de communication BPIB

Bonjour,
je dois automatiser un banc de mesure et je suis bloqué depuis un moment. J'utilise Labwindows pour mes programmes et je pilote les appareils via une carte PCI GPIB 488.2 depuis un PC DELL très rapide sous windows XP.
Mon banc de mesure est équipé d'une boite à relais (Scanner HP 3495A), d'un capacimètre Boonton model10A et d'un voltage Source measure Keithley 237. J'utilise pour mes tests de commandes l'utilitaire measurement & automation explorer.
Je rencontre 2 problèmes:
Tout d'abord, lorsque j'envoie les commandes au hp3495A pour fermer les relais, il n'execute pas ma commande, alors que celui ci fonctionne correctement sous un programme réalisé sous Visual Basic avec un PC pas très rapide sous windows 98, j'utilise les bonnes commandes mais rien ne se passe, je ne comprend pas( à noter que le programme sous VB utilise une carte HPIB je sais pas si il existe une grande différence entre HPIB et GPIB).
Mon second problème se trouve au niveau du capacimètre, celui ci execute correctement mes commandes en écriture mais lorsque je veux faire une lecture, il me met une erreur de timeout semblablement (iberr = EABO) or j'ai testé tout les timeout et j'ai toujours le même problème.
Il n'existe pas de driver sous Labwindows sur ces appareils.
Je ne rencontre aucun problème au niveau du Keithley237.
Pouvez vous me guider sur ce problème, c'est très important merci

Bonjour, je ne connais pas le 3495A. Est il compatible avec la norme 488.2?
J'ai en effet trouvé ce document
Comme énoncé dans le document laissez un certain temps entre l'écriture et la lecture.
Etes vous sûr d'avoir aussi correctement configurer les différents paramètres inhérents à communication GPIB?
Il se peut aussi que vous n'ayez pas ajouter le bon caractère de fin de trame comme précisé ici.
Cordialement,
Romain DUVAL || Application Engineer Specialist ||Certified LabVIEW Architect (CLA) || Certified TestStand Architect (CTA)
National Instruments France

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