Adaptateur usb rs232

Bonjour,
J'utilise des adaptateurs usb->rs232 double ou quadruple (prolific)
mais il m'arrive d'avoir des coupures dans la communication qui ne se produisent pas avec le port integré de la carte mere
Est ce que cela peut etre du au ports usb de mon pc ou plutôt aux adaptateurs , j'ai essayé sur un autre pc avec des adaptateurs
de la même marque et même probleme
Avez vous deja constaté de genre de soucis, auriez vous des adaptateurs à recommander hormis les adaptateurs NI ?
Cdt
Tinnitus
CLAD / Labview 2011, Win Xp
Mission d'une semaine- à plusieurs mois laissez moi un MP...
RP et Midi-pyrénées .Km+++ si possibilité de télétravail
Kudos always accepted / Les petits clicks jaunes sont toujours appréciés
Don't forget to valid a good answer / pensez à valider une réponse correcte

Salut tinnitus,
perso j'ai pas eu ce genre de soucis, mais j'ai constaté des tempo différentes dans la com en communication avec un même équippement : Par exemple un adapatateur A, je devais attendre 10ms avant d'avoir la réponse de mon esclave, et avec un adaptateur B, je devais attendre 50ms avant d'avoir la réponse. 
J'ai déjà utilisé un convertisseur prolific, et je n'ai jamais eu de coupures de com...
Bon courage a toi,
V-F

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