Loading binary data to graph

Hello, I have a VI that uses an XY-Graph to graph 2 plots and after my buffer exceeds a certain limit it writes that data into a binary file and saves it on my computer. Now I'm trying to make a VI that can open that binary file and display it on an XY-Graph. But i'm having trouble, I keep getting an error... I'm using the LabVIEW Example VI "Read Binary File" to do this. My data is a cluster of 2 2D arrays, each array contains the X and Y values needed for the plot.
I guess passing the data isn't as stragith forward as I assumed, does anyone know what I may be doing wrong? Here's a screen shot of the error.
Thanks!

Without the actual code to debug, I can only make a few guesses/observations.
1. No need to read the file size, just set the count of Read from Binary File to -1 and read the whole thing. Your calculation is incorrect, count is the number of 'elements' to read, not necessarily equal to the number of bytes. For example, if you set the datatype to I32, you will read 4*count bytes.
2. That datatype does not seem like the proper one for a multiple XY graph. You should have an array of clusters containing 2 1D arrays. Basically an array of what is called 'output cluster' in your screenshot. To be honest, I am a little flumoxed as to why XY Graph seems to like that datatype.
Right-click on XY Graph and choose Create Constant and see what you get.
Message Edited by Darin.K on 12-07-2009 01:26 PM

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Show 8 bit binary data on graph

Hello..
I have an 8bit binary numeric control and I want it to be shown on graph so that it would look like a digital bit pattern just like image below.
Please Help..

Try something like the attached draft (LabVIEW 8.2).
convert number to boolean array
convert boolean array to (0,1) array
graph (0,1) array.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
GraphBits.vi ‏13 KB
GraphBits.png ‏8 KB

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The Labview VI "Write to Binary File" writes data to a file in a linear format using Big Endian numbers of the type wired into the "Write to Binary File" VI. The array dimensions are listed before the actual array data.
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Thanks. I have the same questions as I tried to load labview binary data into Matlab.
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Conversion from scaled ton unscaled data using Graph Acquired Binary Data

Hello !
I want to acquire temperature with a pyrometer using a PCI 6220 (analog input (0-5V)). I'd like to use the VI
Cont Acq&Graph Voltage-To File(Binary) to write the data into a file and the VI Graph Acquired Binary Data to read it and analyze it. But in this VI, I didn't understand well the functionnement of "Convert unscaled to scaled data", I know it takes informations in the header to scale the data but how ?
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Nanie, I've used these example extensively and I think I can help. Incidently, there is actually a bug in the examples, but I will start a new thread to discuss this (I haven't written the post yet, but it will be under "Bug in Graph Acquired Binary Data.vi:create header.vi Example" when I do get around to posting it). Anyway, to address your questions about the scaling. I've included an image of the block diagram of Convert Unscaled to Scaled.vi for reference.
To start, the PCI-6220 has a 16bit resolution. That means that the range (±10V for example) is broken down into 2^16 (65536) steps, or steps of ~0.3mV (20V/65536) in this example. When the data is acquired, it is read as the number of steps (an integer) and that is how you are saving it. In general it takes less space to store integers than real numbers. In this case you are storing the results in I16's (2 bytes/value) instead of SGL's or DBL's (4 or 8 bytes/value respectively).
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I normally just convert everything to volts and then manually scale from there if I want to convert to engineering units. I suspect that if you use the express vi's (or configure the task using Create DAQmx Task in the Data Neighborhood of MAX) to configure a channel for temperature measurement, the required scaling coefficients will be incorporated into the Header Information array automatically when the data is saved and you won't have to do anything manually other than selecting the appropriate task when configuring your acquisition.
Hope this answers your questions.
ChrisMessage Edited by C. Minnella on 04-15-2005 02:42 PM
Attachments:
Convert Unscaled to Scaled.jpg ‏81 KB

Fix for "Graph Acquired Binary Data.vi" in daqmx 7.4's "Measure Voltage.llb". (factory gains are reversed)

While perusing binary data collected from the SCXI 1102 and usb 1600, the gains were found
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http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=F7199E619CBF4215E0340003BA230ECF&p_node=201208&p_submitted=Y&p_rank=5&p_answer=yes
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Enjoy.
Best,
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GAMI

duplicate post
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Message Edited by smercurio_fc on 11-14-2008 09:10 AM

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hi
I am trying to write large binary data in theform
of byte arrays on sockets.
Data is as large as 512KB(== 524288bytes) So istore
the data (actually read from a file through
FileInputStream ) and then write on the socketwith
lines like this
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function*/
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writing) sometimes gives error :
java.net.SocketException: Software caused
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Message Edited by smercurio_fc on 06-11-2009 08:20 PM

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Loading binary data to graph

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