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Digital filtering on counters inputs disabled by DIO acces

Hello,
 
I've got some problems using digital filtering on the counters inputs with 6602.
 
My connections are : PFI0 = counter 1 gate, PFI3 = counter 0 gate, PFI4 = trigger for counter0 and counter1.
 
Digital filtering works fine in this configuration.
 
Now, if I configure P0.5 as Tristate output with DAQmxSetChanAttribute (thMasqueTrigger, "Dev2/port0/line5", DAQmx_DO_Tristate, DAQmx_DO_Tristate) just before starting the counting tasks, filtering just seems to be disabled.
 
 
Can you tell me where this behaviour comes from ?
 
Thank you for your help
Best Regards
Franck
 
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