How fast can I read DI port in PCI 6071E?

I have a while loop with no delay running full speed reading a TTL compatible square wave fed into Channel 0 of my DIO port. I then watch for any transition from hi to low, count these transitions and divide by 2 to get the count. This works very well when I apply a signal that is < than 200 pulses per second. Anything above this and I start getting errors with the count, ei. count is less that actual period. Did I reach the limit of the card or the computer system? I would like to be able to read a period of 400/sec. Any ideas?

Your problem is that you are using software timing. Your loop runs only at the whim of the OS. There are lots of other things that can get in the way. Remember the engineer's motto about the right tool and the right job!
You should discuss your I/O requirements with either your NI sales rep or an Alliance Member like us before choosing your hardware. We can work with you to make sure that you do not end up with a non-workable solution.
You might be able to squeeze more than 400 acquisitions per second out of your system, but you will need LabVIEW 7.0 with DAQmx to do it. Also, the minute you want to do anything else with the PC while you're looking for pulses, you could miss pulses. Todd gave you the best answer. You need more counter-timers? Buy
a 6601 and get four of them. That will give you up to 20,000,000 pulses per second of counting ability all hardware timed.
Daniel L. Press
PrimeTest Corp.
www.primetest.com

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