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!&nbsp; I understand you want to send a 96 bit stream with either the PCI 6133 or the USB 6501.&nbsp; The digital lines on the <a href="http://sine.ni.com/nips/cds/view/p/lang/en/nid/201937" target="_blank"> PCI 6133</a>&nbsp; support hardware timing.&nbsp; This means that you can provide a clock to time the digital output.&nbsp; The maximum clock rate you can provide is 10 MHz (or 10^6 bits per second).&nbsp;
Time = 96 bits * (1 second / 10^6 bits) = 96 microseconds
The digital lines on the <a href="http://sine.ni.com/nips/cds/view/p/lang/en/nid/201630" target="_blank"> USB 6501</a>&nbsp; are software timed.&nbsp; This means that the output speed will depend on how fast your computer can execute software commands.&nbsp; You can probably expect to take anywhere from 100 to 500 ms.&nbsp; Refer to this <a href="http://digital.ni.com/public.nsf/allkb/51754212AD10BDCE862573BD007BFDD2?OpenDocument" target="_blank"> KnowledgeBase</a> for more information on hardware timed DIO.&nbsp; 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&nbsp;generate a sample clock for&nbsp;a Digital Input/Output task.&nbsp; Here are a couple examples which demonstrate how to do this.<a href="http://zone.ni.com/devzone/cda/epd/p/id/4478" target="_blank"> M Series Hardware-Timed DIO with Counter Clock Generation</a> <a href="http://zone.ni.com/devzone/cda/epd/p/id/4485" target="_blank"> M Series Correlated Digital Input with Counter Clock Generation in ANSI C</a>