I want to read 8 bit input from USB-6501. What is the approximate maximum speed that I might able to get?(I know it is software dependent) If I am not clear enough, The question I have is will it read 1 kword/s if I connect 8 bit output to the device?
it will depend on your computer, there is a knowledge base article with some benchmark results that show that you can reach almost 1kHz update rate for a port if you are using a high performance PC. Nevertheless, the digital lines on the device are software timed and meant to be static - that means they are not designed for fast switching operations - that is why there is a limit in speed. If you would like to do a faster and / or hardwaretimed operation, you should think about using a M-Series board.
Ingo Schumacher Systems Engineering Manager CEERNational Instruments Germany