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more channels

Hi,
 
I have a NI-SCXI-1600 USB DAQ with SCXI 1520 strain analog input (40 channels).
 
In my project, I have to use one channel(a0) to do readings in the beginning. Later I have to use another  channel (a1) to start a new reading while keep the previous going.
 
I wrote a program, see attached. I start the first readings, then stop it when I add new channel to start a new readings. The problem is when I restart it, the readings of fisrt channel become zero. It does not work. What is wrong with my program?
 
Also the way I split the array (it will be 37D array since I will use 37 channels) looks ugly. Do you have some good suggestion?
 
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