Decode data

[jkas]

Hi, I have this binary data that I have decoded in matlab. I would like to achieve this same purpose in labview but i am not sure where to start from. I have attached all relevant files and would appreciate any assistance I can get. 

[ZYOng]

You can Integrating Compiled MATLAB Functions with LabVIEW with a .NET Assembly Approach

[GerdW]

Hi jkas,

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@jkas wrote:

Hi, I have this binary data that I have decoded in matlab. I would like to achieve this same purpose in labview but i am not sure where to start from.

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It seems you read a byte stream, convert those bytes to a hexadecimal-formatted string and then parse the data from that string back to numeric values. This can be done easily in LabVIEW directly (much easier than calling Matlab code from LabVIEW IMHO).

• I think this can be done directly with the byte stream instead of converting to string and back to numbers more easily.
• Can you provide an example of your hexadecimal formatted string for a full message of voltage/current/temperature? Even parsing that string is much simpler then getting 3 individual substrings when using ScanFromString with the right format string…

Example for string parsing:

(You can do the same more efficient by processing the byte stream directly!)

[jkas]

Thanks, GerdW. An example of the hex formatted string is attached. 

[GerdW]

Hi jkas,

why do you write your (matlab) code as "don't use x Zeros" when there are tabs?

It could be so easy:

(Again: processing the byte stream will be easier than converting to string and back to numerics!)

[jkas]

Yeah I noticed so I changed the code. New formatted hex attached. 

[jkas]

How do I process the byte stream directly?

[GerdW]

Hi jkas,

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@jkas wrote:

Yeah I noticed so I changed the code. New formatted hex attached. 

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There are still tabs between the values so my previous suggestion is still valid. It doesn't matter if there are (some) leading zeros or not...

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@jkas wrote:

How do I process the byte stream directly?

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You read the number of bytes per value and convert them to your required data.

1. Like read 3 bytes (for voltage?) and use the JoinNumbers function to create the voltage value.
2. Then read the next 2 bytes (for current) and use JoinNumbers to create the current value.
3. Then read 2 bytes (for temp)...
4. Start over with 1. until end of file...

[jkas]

Uhm if it's not too much to ask, can I get a sample vi that does this?

[GerdW]

Hi jkas,

example:

(There are more efficient ways to solve this poblem, but the current suggestion is straight-forward.)

There seems to be a problem in your data, there are several rows in the data with "malformed" content, like row #113 in the image...