How to sweep IV curve using GPIB instrument (ILX 3220)

Hi, I'm new to Labview---I learned basic stuff, such as strings,arrays, structures,etc. I have an ILX-3220 current source, NI-488.2,and I want to make an IV curve using a light-emitting-diode. I'm really confused about what I should use. I downloaded intrument drivers from ILX's website.They provide some example VIs, but I can only set one current and read one voltage. I try to configure the block diagram by adding a for loop, then I got lost among the complicated SubVIs. I also tried to use I/O Instrument assistant to communicate with the current source, but apprarently it didn't listen to me . I can input the commands one by one (LAS:LDI 5 LAS:LDV? LAS:LDI 10 LAS:LDV?.....)----not much differently from writing down by hands. Is there a way to sweep IV curve using ILX 3220?
Solved!
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Yes, you will have to use a loop - either a for loop or while loop. I'm not familiar with the instrument or functions but at the minimum, you would need to place the function that sets the current and the function that reads the voltage inside the loop. The loop would probably have a shift register and you would wire this to the current set function. Inside the loop would be an increment function and some code to determine if the max current has been set. Below is a generic ramp application.
Attachments:
Generic Ramp.PNG ‏6 KB

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I've been trying numerous things to get this to work, and I've had little luck in getting exactly what I want. I have been able to get data from some example VI's designed for serial read, and I was able to tweak them some, but this data seems to be only able to be saved to a .txt file. I want the data from my anemometer to be read along with the time it was read and stored in a spreadsheet.
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Please see attached screenshots if you want to see what I'm talking about below.
At this point I can read the data from my device. The default count value is 1024 bits. If I click "execute" the device is read and I can read the data in the textbox that says "buffer." However, my device only makes one 16-bit reading every 1.6 seconds, so I have to let the device sit for some time before it can fill the buffer up with 1024 bits. If I don't, the reading takes place, I can see all of my data in the buffer, but the "Return Count" value on the screen is something significantly less than the "Count" value. This makes sense because the buffer did not have time to fill. Needless to say, the "Return Value" says "bff0015" which means it would return the time-out error.
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Attachments:
Instrument IO view select.pdf ‏119 KB
Instrument IO view read.pdf ‏125 KB

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I am having the same problems. My guess is that a lot of people are having the same problems and just living with it. Those of us who know where to go on the Internet come here to find a fix.
It seems Verizon has some explaining to do. Maybe they should try Beta testing new software a little better. I would rather have to wait longer for something that works. I am sure that some manager or director said this is close enough, deploy it and we will see what happens. Well, you are seeing the problems. Time to fix your mistake.
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If you want to be up front about this, then just tell us. We are adults and can handle it. If you made a mistake, own up to it and give us some credit for doing your Beta testing in the field.
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I am going to be repsonding on a daily basis to keep this topic at the top of the list.
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How to sweep IV curve using GPIB instrument (ILX 3220)

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