how fast can i pushout a 96 bit-stream with a pci 6133 or usb 6501?

[millie]

I'm new to DAQ and would appreciate any help with this question or any additional information anyone has.
Thanks,
Millie

[RT4CY]

Thanks for posting on the NI forums!  I understand you want to send a 96 bit stream with either the PCI 6133 or the USB 6501.  The digital lines on the PCI 6133 support hardware timing.  This means that you can provide a clock to time the digital output.  The maximum clock rate you can provide is 10 MHz (or 10^6 bits per second). 

Time = 96 bits * (1 second / 10^6 bits) = 96 microseconds

The digital lines on the USB 6501 are software timed.  This means that the output speed will depend on how fast your computer can execute software commands.  You can probably expect to take anywhere from 100 to 500 ms.  Refer to this KnowledgeBase for more information on hardware timed DIO. 

Message Edited by RT4CY on 06-25-2008 09:08 PM

[millie]

Hi Rod,

Thank you for your reply. Based on the differences between these two DAQ cards I will be using the pci-6133 to pushout these 96 bit streams using LabVIEW. How and what instrument do I use to time the digital output (clock)?

[RT4CY]

You could use one of the counters on the PCI 6133 to generate a sample clock for a Digital Input/Output task.