Why the my linear encoder is only tend to read negative?

I have a linear encoder, that I am using with one NOR cDAQ 9184 & 9401.  I basically used the example of linear encoder, I found here on the website of OR, however, when I run the program I find that measuring only in one direction is the precise movement of reading.  By this I mean when my encoder moves upward (actually my camera moves down and the encoder is fixed) I can move properly, but when moving in the opposite direction I'm away.  I'm not a linear sum, very different each time.  Sometimes when the movement he began first almost looks resets the unit to its original position (0 "), but I am helpless as to why.  Does anyone have an idea on how to remedy this situation?

I'm pretty confident I have things wired properly while this same configuration/encoder reads correctly in MAX, see the second screenshot.

Well it seems that the question was much easier than I thought.  Of course, I'm a newbie to this, but I think that most of the confusion was due to the lack of detailed information.  None of the documents of OR really explained me the option counts two impulses, more the X 4 and documentation of the mentioned readhead times count four.  However, after receiving no not any solid solution, I started completely over and tried all the options I had along the way.  In short, my solution was to simply what I posted in my screenshot, but simply change the X 4 option for counting of pulses two option.

Tags: NI Hardware

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