On 3 Feb 2013, at 09:00, Bruce Klawiter <bmkl...@yahoo.com> wrote:

> Can I have to little or to may pulses, I am thinking a 1024 or 2048 CPR 
> differential encoder and using Mesa 7i43 and 7i33 cards.

You can have too many pulses. You need to consider the max count rate of the 
hardware and the max speed of the axis. It probably suffices to only consider 
motor rated speed. 
3000 rpm x 8192 counts = 400kHz. 
The 7i43 can count MHz. 
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