Data aquisition from spectrophotometer in two analog channels, X-Y plot

Dear colleagues!
I am new to LabView and I am only starting to learn the system (I have never been a programmer, I'm a chemist to be precise).
I have before me a task to interface an old analog scanning spectrophotometer to PC via LabView.
It has two output analog channels: one is wavelength (two ranges, currenlty let it be 190 to 390 nm; it reads on multimeter as 0.19-0.39 V range) and another one is absorbance (0-1V range). An UV spectrum sholud be an X-Y graph wherein X is wavelength and Y is absorbance.
I am able to read one channel OR another. I am able to read BOTH channels simultaneously, but how can I plot them AGAINST each other, not against TIME?
I am using DAQPad-1200 (LPT interface) and LabView 6.1 (that's why I am unable to read most of the VI's posted on the forum ).
Is such an interfacing even possible given my software and hardware limitations???
Thank you all in advance!

Thanks a lot, johnsold!
I am now able to get something which looks like an UV spectrum! %)
1. I will post an image (later); however, my primary objective is to get two columns of numbers, not necessary to see an X-Y graph onscreen.
2. Without inserting arrays like I did LV always tells about error connecting this data line from two channels to save "2-D data to file" option telling me that input is 1D!
3. I have a manual for the device, it has all of the schematics. I am no electrician though. I will post scanned circuit diagrams then when I manage to scan them.
Now I see two more opportunities to control the device.
A. There is a circuit (+12V DC) on the rear of one of the modlues, which, if shorted for at least 500 milliseconds (according to Tracor manual) can initialize automatic scan. How can this be done using Labview and DAQ device? My first guess is to use an analog output and some kind of a relay, either electromagentic or semiconductor one. Is there any other possibility?
B. In my code I am always asked to write to a file after I initialize the sequence. Can this be done AFTER the sequence is finished?
C. Finally, is it possible to automatically stop the While loop when the number generated by shift register becomes equal to 190?
Here are attached a new code and a sample of data.
Attachments:
Tracor970A-v1.0.vi ‏53 KB
UV-test-01.txt ‏15 KB

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ich versuche eine Messung mit einem analogen Eingangssignal zu starten und zu beenden. Ich benutze die Messkarte NI-USB-6251. An Eingang ai0 ist ein Sinus-Signal angeschlossen. An Eingang apfi0 ist der Triggereingang angeschlossen. Das Triggersignal löse ich immer per Tastendruck auf dem Funktionsgenerator aus. Hier ist ein Teil des Quellcodes:
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Ich habe die Sample Rate (1000/s) und die Samples pro Kanal (4000) so gewählt, dass die Aufzeichnung 4 Sekunden dauert. Ich schaffe es auch die Aufzeichnung über den Trigger zu starten, jedoch funktioniert das Stoppen mit der Funktion DAQmxCfgAnlgEdgeRefTrig nicht. Aktuell ist es so, dass das Array immer mit 4000 Werten gefüllt wird.
Ich hatte mir erhofft, dass ich durch einmalige Triggerung die Messung starten kann und beispielsweise nach zwei Sekunden erneut triggere und die Messung damit stoppe und dann nur 2000 Werte eingelesen habe.
Ich hoffe, ihr könnt mir dabei helfen.

Hi Martin,
I looked over your code and noticed that you called the function without checking the returnvalue.
Try to change the line to the following:
First: define a new int32 value and call it for example: errorcode
Second: The function returns a status code, wich if it fails, includes an error code so save this code in the new generated value
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Regards
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multidevicesync_analoginput_streamtodisk.vi ‏197 KB

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- http://digital.ni.com/public.nsf/websearch/4D1435DF82EF494186256D8A006DD6D4?OpenDocument.
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National Instruments France

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