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Problem with data acquisition from two AI channels (error -50103)

Hello,
 
Although there are some discusions about this topic I couldn't fix my problem. I am able to read and display  the pressure data from a single channel as you can see in singlechannelDAQ.vi. But now I need to read and display the pressure data from the second AI channel. First I thought it could be so easy that I just copy and paste the same code and run it. But the result is error -50103. Then I understood the cause of the problem. (With multiplexed data acquisition boards (E-Series and M-Series), only one analog input and one analog output task can be run at the same time. This is the case because all analog input channels require use of the same channel multiplexer and sample clock.) I found some solutions in this forums and adapted my code (twochanneltry1.vi) but it didn't work as well. There are also some solutions which offer to sample, read the first channel then stop the task and do the same procedure for the second channel. It doesn't suit to me , I think because I acquire the pressure datas in a while loop and it should stop when I press the stop button. I hope I could describe the problem clearly. I also want to display the results in two different graphs. Any help would be highly appreciated.
 
 
Best regards,
 
Ahmet


singlechannelDAQ.vi:
http://forums.ni.com/attachments/ni/170/263606/1/singlechannelDAQ.vi


twochanneltry1.vi:
http://forums.ni.com/attachments/ni/170/263606/2/twochanneltry1.vi
0
x9561 (148441)
8/6/2007 1:40:08 PM
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Thanks Dennis Knutson and TonP for your replies.  I couldn't try this code with my DAQ card yet, but I don't expect any problem. It works fine with the simulated signal perfectly and solves my problem. But I have a question. What would be a solution, if I had wanted to configure one AI channel as RSE and the other channel as differential. Now we use differential configuration common for both channels, in this case we couldn't.
Thanks for your concern.
Ahmet
0
x9561 (148441)
8/7/2007 10:40:05 AM
If you want different terminal configurations for the channels, then you use separate DAQmx Create Channel functions.
<img src="http://forums.ni.com/attachments/ni/170/263840/1/Different%20Configurations.PNG"> Message Edited by Dennis Knutson on 08-07-2007  05:52 AM


Different Configurations.PNG:
http://forums.ni.com/attachments/ni/170/263840/1/Different Configurations.PNG
0
x9561 (148441)
8/7/2007 12:10:06 PM
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