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Re: Output same TTL as input

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Brooks_C

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Jul 25, 2008, 4:40:09 PM7/25/08
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Hello Aaron,

 

The NI 9401 has 8 bi-directional digital IO lines.&nbsp; It is possible to read in a TTL signal, manipulate it, and then output it on another line, however there is inherently a delay because you have to read, manipulate and output sequentially.&nbsp; One programming technique that can be used to speed up this response time with a multicore computer&nbsp;is called pipelining.&nbsp; For more information on this please see this article:&nbsp; <a href="http://zone.ni.com/devzone/cda/tut/p/id/6425" target="_blank"> Programming Strategies for Multicore Processing: Pipelining</a>.

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The primary limiting factor is the rate at which you can run your loop.&nbsp; This is limited by several things including the computation time, but on a windows operating system you'll top out somewhere on the order of 1 kHz.&nbsp; This will vary considerably on different computers so your results may be better or worse by a factor of 2 or more.&nbsp; If you require the feedback to be much faster then you may need to consider changing to a real-time operating system or FPGA programming/hardware.

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I hope this helps and have a great day!

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