Using DMA to update values in an array

Good afternoon,
I've been running into a few problems with my vi, and I'd like to give a bit of the background information before I ask my questions. I'm using Labview 8.5 and the NI USB-6009 DAQ. I want to use an encoder to control values that are being written to a file for DMA. I found that I couldn't use the encoder as an external clock since the 6009 DAQ doesn't have this capability. So I've been trying to go a differenet route by using a case structure with a True/false statement to allow me to input values from a simulated signal into a write vi (each time the encoder pulses, a value from the simulated signal should be inputed into the write data storage vi). From there, I want to then read those values and put them into an array. So the plan is to have a 10 element array that reads in values from the storage file (just like in FIFO for FPGA). As I continue reading values, the oldest value of the 10 element array will leave the array and be replaced by a new value.
Now here come the questions, I'm using the Write/Read data storage vi's and I keep getting errors. First, if I'm wanting to use DMA to read these values am I using the correct vi's, or is there a different route? Also, once I read these values into the array how would I be able to constantly update the array in a descending order from begining to end of the stored values?
I'm posting my most recent vi that I've been editing. Also, in advance, thank you!
-tjm
Attachments:
Using Encoder as an analog input 10_9_13 - Copy - Copy.vi ‏390 KB

Thank you for your reply.
First, I'm ultimately trying to use the array as input into a visual display for a meter (to display the mean of the array). I've been successful (in the past) with inputting into an array by not using DMA and using the Sort 1D Array point by point vi. The only problem is the timing mechanism with the encoder, and you are correct with stating that there is uncertainty with the encoder when trying to retrieve values from the input signal (sine wave). I thought about going down the route of using the encoder as a counter (since I am able to see the counter increase by a single digit with each pulse).
My question would then be how to control the case structure with a counter input?
I'm posting both my setup with the Sort 1D Array Point by Point and the simple vi for the encoder as a counter. My idea is to try to merge the two and have the counter control the case structure.
Is there a way I can do this?
Attachments:
Sort 1D Array Pt by Pt.vi ‏189 KB
Using Encoder as a counter input 10_9_13.vi ‏123 KB

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