XNET Signal Conversion

Hello all,
Please help me on my VI.
I want to read the more data from log file (i.e. >2GB) with read from notepad file( line by line) or spread sheet. This output I’m giving to CAN frame (with NI XNET).
In NI XNET Convert.VI I’m getting last frame values (Signal data), so how can we get the all frame values with time interval( for selected signals).
My log file contains two types CAN networks, I want to read both .DBC files with NI XNET convert.VI and I need extract the data for selected signals .
Please check my VI and give me your valuable suggestions.
Thanks & Regards,
Guru
Munna
Attachments:
sample for CAN signal.zip ‏28 KB

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CAN Frame Signal Conversion With XNet

When dealing with CAN, most new developer struggle with the Frame and Channel (or Signal) conversion. Developers are trying to get away with using the cheapest CAN hardware, and as a result are opting to not use XNet hardware but instead use things like the USB 8473, or using non-NI hardware like the ValueCAN by Intrepid, or using Vector hardware, or CAN to serial adapaters. The problem with all of these is you generally just read and write frames which is the raw form of CAN. When using these cheap devices you can't ask the CAN bus what the signal Bus_Voltage is, instead you need to perform a frame read, find the frame associated with the signal, then pull out the bits for that signal, then scale the signal based on the signal selected.
All of this is doable but a pain and can be very custom. That's one reason NI came out with the Frame Channel Conversion Library. This library converts from Frames to Channels using an industry standard CAN database file. The problem with this library is it hasn't been updated in 5 years, and has known issues which likely will never be fixed.
NI has since come out with XNet which supports reading and writing signals on XNet hardware. The XNet drivers also support converting Frames to Signals without needing hardware at all. This conversion has several limitations, and really only works for getting the latest value for a signal, not all values. And in addition to that if the signal was never seen, the value will be the defaul value for that signal, not NaN.
So I wrote a wrapper around the XNet conversion library to handle going from signals to frames, or from frames to signals. Anyone looking to use a DBC file, on hardware that only supports frame API should use this conversion library, or at least use the XNet conversion sessions.
CAN Frame Signal Conversion Using XNet
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If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

Hello Hooovahh,
Nice work . It’s very useful.
I’m also converting CAN Raw data to Physical values in my project. Yes, your correct XNET APIs have some limitations. as you mentioned, there is one more limitation I found,
If your Message Data length (Payload) is 4 Bytes (example) and other CAN Frames are having more than 4 Bytes then its throwing Error (Error Code -1074384737).
While converting CAN Frames to signals, we will get different Payloads but, our selected signal message have 4 bytes then XNET will gives an error (at the time of Data Conversion).
As per attached Snap, My Signal is related to IDxBB and I’m sending two different Frames then XNET will not convert.
Hooovahh Wrote:
NI has since come out with XNet which supports reading and writing signals on XNet hardware. The XNet drivers also support converting Frames to Signals without needing hardware at all. This conversion has several limitations, and really only works for getting the latest value for a signal, not all values. And in addition to that if the signal was never seen, the value will be the default value for that signal, not NaN.
When we will send Frame by Frame then we will get all values (not only recent values). XNET will take previous value (if data is not present for Next iteration)
Please check this snippet for all values & NaN Display.
Munna

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I have a selected number of signals from a database, and I am trying to create XNET Signal Output session from these signals of database.
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Error -1074384751 occurred at XNET Create Session (Signal Output Single-point).vi:4
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Hello all,
In one of my applications, I am deploying a CAN database file(.dbc) to RT system, and extracting signals through the cluster of .dbc file. Now once I have the list of all signals inside the database file, there would be some signals which would be multiplexed (If imported in MAX, you can see "Mode" for such signals). Now when I try to create a XNET Signal Output Single Point session out of selected signals, I get the following error:
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FraggerFox!
-FraggerFox!
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"What you think today is what you live tomorrow"

Hello all,
Thank you so much for support as always.
Yesterday I solved this issue.. Its explained in XNET User Manual..
Sorry for late reply.
Munna

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I have a CAN database in a .txt format. I used access and excel to map it to a .xml file. When I try to add it to the NI-XNET Database Editor in the Manage NI-XNET databases and add alias it give me the error: x BFF63081. How can I take a .txt file database and convert it to a NI-XNET database?

I think the common formats that XNET support are CANdb and FIBEX files (amongst others...e.g. for Flexray). I think FIBEX is the name. A CANdb file is essentially just a text file so maybe you can parse out the messages fairly easily that way. FIBEX files are the file format that LabVIEW creates when you edit/create an XNET database from their user interface.
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How to get CAN message periodicity programmatically?

When I have messages with different periodicity in CAN data base file(.dbc), how do I programmatically know what is the periodicity of a given message? In the X-Net data base editor I can see the periodicity, but is there any way to get it in labview code?
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Go to Solution.

First the Automotive subforum maybe of more help if you don't find the answers you need here.
Next I'd like to say I despise that conversion library and wish NI would take it off of this site. It hasn't been updated in 5 years and it won't be updated again. XNet has the same frame signal conversion functionality, and you don't need a XNet hardware to use it. It also has bugs that I've reported to NI and their suggestion was to just use XNet so that is my suggestion to you.
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XNET Signal Conversion

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