Sync usb 6509 with usb 6255

Question

Hi folks.
I'm trying to sync digital output for multiplexing purposes and acquiring analog signals (voltage) for each address.
However I keep getting error 200278 and others similar.
And when I don't get an error message, the output files always have the value for the last iteration in the For Loop.
Is there a way to sync the digital and analog boards? I have seen other tutorials but the problem is that the USB 6509 has no PFI lines.
Can I use the Start.vi and some structures to sync?
I have attached my vi.
Hope someone can help.
Rui
Attachments:
Dados EIT V10.0 1-16 V2.vi ‏97 KB

Answer 1

HI Rsilva,
First of all, error 200278 is due to the use of a finite acquisition task in a loop. I encourage you to read the information presented from the following link, which allows you to understand and correct this error:
Error -200278 at DAQmx Read
http://digital.ni.com/public.nsf/allkb/4159A4241B8A24B3862570EC007AB6B7?OpenDocument
Since 5609 does not support timed digital generation, it is not possible at once to ensure perfect synchronization of digital I / O on both cards at the same time. Therefore you can generate samples on request at the same time, and you'll be depending on your OS.
Best regards,
Rémi D.
National Instruments France
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