the "incorrect" file structure

Hi all

I am trying to add additional columns to my output data file, which captured initially given 3 - axis load cell. I would like to add data the local coordinates of the two stepper motors that carry the load cell. The idea is to capture the profile of movement as well as the acquisition of the force.

There are two problems that I met, is one major and one minor. I'd appreciate it really is can someone give an idea of how address them.

(1) the output file's strange structure, cell data are entered correctly, but coordinated captured engine in a strange way, there are some gaps between the record. I am attaching the file *.txt for example what happens. I feel that it is something to do with the frequency of acquisition vs. loop timing, but I'm not 100% sure.

(2) it is rather aesthetic problem. Ideally, I would like to have control over when to start "depreciation" in a txt file. I thought that if I put a case structure within the main loop and tie a switch, I can achieve my goal. Apparently, it did not work as I want. When I start my program, it creates a .txt file, regardless if the switch is on or off, and then when I turn on the switch, it overwrites the previous file and creates a backup of the old file. Is it really possible to do in Labview? My officemate told what I want "breaks continuous data flow concept in Labview", so I'm a bit puzzled.

Thanks in advance

I don't know what you mean by the phrase "damping data in a text file.  I'll assume you mean that the data in the text file logging.

The reason why the switch is not working for you, is that you have an entry on the measure function go in the right and wrong of the case that the switch is connected to.

The reason data gets overwritten and saved/renamed files because it is the way in which the parameters are in the express VI properties in the true and the false case.

The reason why you get a large group of coordinated data of load cell with a single set of stepper motor is the amount of data that you collect at each iteration of the loop.  In each loop, you collect a single piece of data from the serial port with a parameter for each engine.  But as DAQmx, collect samples you of N N-channel where samples of N are all the data in the buffer.  If you are left with N lines of data points for one pair of data points in the serial port.  Try N channels 1 sample instead.

What you want are rather simple patches, and I do not think that your desktop companion has a clue what he's talking about in what concerns data streams. Dataflow seems to be fine in your VI.

Tags: NI Software

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