CAN Channel to Frame API

Hi All,
In a bit of a jam...we're using CAN channel api to manage a few functions of a piece of hardware thats on a CAN bus. Works great. Code is attached as a picture.
We are duplicating the system and have loaded the entire PC up and had to resort to a USB based CAN card that doesn't support channel API. Yeah bad.
I found NI provides something called the " CAN Frame Channel Conversion Library 1.0.2" and have been trying to get it to work. I'm not getting any results though...does anyone else have experience with this? Is it possible to modify all our vi's that are CAN based like the one attached?
Talk to me like a little kid on this one, CAN at frame level is completely new to me.
I am able to watch all the data on the bus via MAX and the bus monitor, so I thought this would be more a labview board type question.
Thanks!
LV7.1, LV8.5
Attachments:
CANHelp.PNG ‏18 KB

Hi
I didn't know there is a genuine conversion library
I've been recently doing some work as vacation replacement for a colleague that had a CAN interface for a data logger.
Since the channel API is relatively slow the concept was to log everything in frame API and later convert it to channel by passing it through a virtual CAN bus. This is provided by NI at "ports" 255 and 254 or something like that. You should check the help docu which is not too bad.
The only caveat was that the simulated CAN does by default also simulate delays and transmission time on the bus, you have to explicitly set this to no or zero or something. On TX and RX this works differently one is a property node the other a method. and you have to be precise with the sequence of doing what.
But in the end it worked.
Unfortunately the program is now on the customer's PC. So I cannot be any more precise on the how-to-dos.
I hope it helped just a bit
Gabi
7.1 -- 2013
CLA

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Transmit_once_Receive_Multiple_Msgs.vi ‏99 KB

Hi Vamsi,
If your NI CAN card has 2 ports, you can use the bus monitor to check that the data on the bus is seen by the NI CAN card (you had mentioned that you have other trace tools, but this will make sure that the NI CAN card is reading the bus properly). You can learn about the bus monitor:
How Can I Monitor the NI-CAN Bus?
Using the NI-CAN Bus Monitor Without Going Through MAX
To troubleshoot your code, you can use indicators and probes on your String wires at various pointsto make sure that the frame data looks like you expect as you're parsing it.
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National Instruments
Schedule a Free 1-Hour online LabVIEW Tutorial with an NI Applications Engineer

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847x USB-CANにおけるFrame APIのサポート内容

　USB CANインターフェース USB-8473 と Frame API for C を使用してプログラミングしていますが、まだ対向デバイスがないので実地にいろいろと確認できない状況です。
http://digital.ni.com/public.nsf/allkb/E1A44077DA6C819186257288006B76D7
上記ページに847xでのFrame API 制約等の記述がありますが、関数名等が NI-CAN Hardware and Software Manual Capter11 と一致しておりません。少し内容が古いのかとも思われますが、現行2.5に一致するものをご紹介いただけたらと思います。
基本的には、ネットワークオブジェクトのサポートだけで、CANオブジェクトはサポートしていないと理解しておりますが、細部に関して自信が持てずにおります。
１）
ncConfig() で指定可能なパラメータがボーレートとStartAtOpenの二者のみとのことですが、例えば NCATTR_WRITE_Q_LEN は、なにかデフォルト値が適用されるということでしょうか?
ncWriteMultはタイプスタンプ以外使用可能と思いますが。
２）
ncCreateNotification() は制約無しでしょうか?
３）
ncWaitForState() は、現在でもncRead/WriteMult() をサポートしていないのでしょうか?
以上、USB-CANに関する質問です。

平素よりNI製品をご利用頂きまして誠に有難うございます。
日本ナショナルインスツルメンツ技術部の宮本と申します。
お問い合わせの件に関しまして以下の通り回答いたします。
ご投稿いただいたリンク先の関数名がNI-CAN Hardware and Software Manualと一致していないのは、これらの関数名がLabVIEWで使用されている関数名になる為です。Frame API for Cをご使用いただいておりますので、大変お手数ですがマニュアルのIndex(I-Nの項目)をご参照いただき、どのC関数がどのLabVIEW関数と同様の働きをしているかご確認いただく必要がございます。例えば、CのncCloseObjectは、LabVIEWのncCloseに相当します。また、CのncOpenObjectは、LabVIEWのncOpenに相当します。
1)ncConfig関数での設定なのですが、以下ディレクトリのサンプルプログラムをご参照いただければ設定をご理解いただけると考えております。
C:\Program Files\National Instruments\NI-CAN\MS Visual C\Frame API examples\CAN Receive
2)ncCreateNotification関数は、上記リンク先、またマニュアル(11-39)にてサポートされている関数として記載されておりません。
3)上記リンク先にありますように、ncWaitForState関数は、Read MultipleとWrite Multipleをサポートしていないと認識しております。
上記内容をご確認頂き、ご不明な点がございましたらご返信くださいますようお願いいたします。
よろしくお願い致します。

Frame API or channel API

HI,
I will use a CAN (NI-CAN 2.1.3 ) with labwindows CVI 5.5 on win2000, but still now i have no idea about the difference between Frame API und the channel API ?
thank you

Hi und thank you tecoGmbh
I have already known the answer, i have took a look at the doc thank you again

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Hello,
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LV 8.5.1
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Go to Solution.

If you look at this vi from the NI-examples:
Multiple CAN Cards Frame API Single DAQmx Card Input.vi
this is what I'm doing. As I said, this example is behaving the same way as my program. CAN0 responds, CAN1 doesn't.
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-DB

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I want to transmit a CAN message periodically using Frame API's. I am able to send messages which dont have modes inside the message. For some messages having multiplexer in ".ncd " files and inside that multiplexer having different modes. Now in order to send all the modes of that message periodically by configuring them once by using Frame API's i did not find a way. I am able to send messages but the last updated mode is only sent periodically. Is there any way that CAN message having different modes can be sent periodically, updating all modes periodically automatically using Frame API's.

Hello Kpraveen,
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mode 1 really has a period of 10ms...
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National Instruments
www.ni.com/support

Where can I find the Frame API for CAN

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I'm fairly new to labview and working with CAN Buses. I am trying to read messages from a CAN Bus. I downloaded some examples from the web site, and I ran the programs, but it seems like I am missing a bunch of VI files for example, "ncConfigCANNet.vi" or "ncOpen.vi", all of which are part of the Frame API. I am wondering, where I can get these files, as I have been searching all over the web only to find nothing.
Thank you very much for any responses!
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Have you installed the NI-XNET driver ? If yes, have you checked the NI-XNET Compatibility Library for NI-CAN ?
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m_attrList[0] =       NC_ATTR_BAUD_RATE;
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m_attrList[1] =
NC_ATTR_START_ON_OPEN;
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m_attrList[4] =       NC_ATTR_COMP_STD;
m_valueList[4] =    NC_CAN_ARBID_NONE; //handle all
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//CC.NC_MASK_STD_DONTCARE;//0x791;
m_attrList[5] =       NC_ATTR_MASK_STD;
m_valueList[5] =    NC_MASK_STD_DONTCARE;//0x791;
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(...please continue on part 2)

for answer see part 2
DirkW
Message Edited by DirkW on 01-10-2006 04:01 PM

NI-CAN Frame API: Variable Periodic CAN Object

Hi,
I am developing an application that send CAN messages with NI-CAN Frame API.
Some of my messages have specification of variable periodic where
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If I configure the CAN Object's communication type to transmit data by call, the data is only sent once and not periodic.
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Is there suggested way to have such a message?
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Hello,
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Reading the mode channel start and no. of bits using the CAN channel API

Currently I am using the CAN channel API to get information from a CANdb file. I'm using it to get max, min, scaling information, etc. However, I can not use it to get the start bit and the number of bits in the channel mode when using mode-dependant channels. Is there an easier method to retrieve this information using one of the CAN API's instead of manually parsing the file myself for the information?

I think that there has been some misunderstanding with regard to the
original question. I believe Dillon is trying to find the start bit and
number of bits in the multiplexer. The terminology of multiplexer and
mode gets a little confusing. For clarification, my understanding is
that a mode is a specific value of a multiplexer. In the case of Dirk's
example code, he was able to retrieve the number
of bits of the CHANNEL, but not the number of bits of the MULTIPLEXER.
I believe that I have run into a similar problem to
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Database (*.dbc) programmitically. I have attached a zip containing a
VI and some *.ncd file to allow others to see my progress thus far.
This is a heavily modified version of Dirk's previously posted program.
As you can see, it is easy to get a list of messages using the "CAN Get
Names" VI. Using that list of messages, it is also easy to get a list
of channels by reusing the "CAN Get Names" VI. The list of channels
does not include any information as to whether or not they belong to a
multiplexer, but fortunately we can use the "CAN Get Property" VI to
find out which channels are mode dependent and the value of the mode
that the channel corresponds to (if it is mode dependent).
Unfortunately, this does not give us any information as to the location
or length of the multiplexer which contains the mode. Thus, I know
whether I should be looking for a multiplexer and I know what value to
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for that value in the CAN message.
Interestingly, by
playing around with Dirk's database that he had attached, I was able to
determine that the list of channels does not always give out the same
information. Typically, you will simply receive an 1D array strings
containing only the channel names, but the output is different in the
event that you have a database that meets the following criteria:
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    2. The database contains at least two multiplexers
In
this case the output will be a 1D array of strings in which the
repeated channels (regardless of whether they are in the same
multiplexer) will be output in the format "<message
name>.<multiplexer NAME>.<mode value>.<channel
name>". The channels that have unique names are simply output as the
channel name. Now this is helpful in that by default the multiplexer
name contains the start bit of the multiplexer, but this cannot be
relied upon. The creator of the database could easily change the name
of the multiplexer and the format is only adhered to when the
previously mentioned criteria are met. Also it still does not tell us
anything about the number of bits expected in the multiplexer (remember
Dirk had found the number of bits expected for the CHANNEL).
I have found another alternative output format when the following criteria are met:
1. Two channels (in different modes) have the same name
    2. Only one multiplexer is contained within the file
In
this case the output will be a 1D array of strings in which the
repeated channels will be output in the format "<message
name>.<mode value>.<channel
name>". Again, this special format is only used for the repeated
channels. Uniquely named channels are simply output as channel names. While this is not particularly useful, but I thought I should mention it.
It
is also probably worth noting that I found the previously mentioned
alternative formats by directly reading reading a *.ncd file. It
appears that by reading the channels directly from MAX we get at least
one additional format (<message name.channel name> ). Considering
that this is actually even less information and since my application
specifically requires that I directly read a CAN database without the
assistance of MAX, I have not significantly explored this avenue.
Let
me finish by reiterating the question that I am asking: How do you
programmitically determine the start bit and number of bits of the
multiplexers in a CAN database (*.ncd or *.dbc). I have attached a zip
file containg my current "testing" VI and some databases to illustrate
the results that I have described above.
Message Edited by William Griffin on 01-06-2009 04:58 PM
William Griffin
NI Certified LabVIEW Architect
NI Certified Professional Instructor
DISTek Integration, Inc. - NI Certified Alliance Partner
http://ww2.distek.com
Attachments:
test_mode_dep_msg_rev_B.zip ‏18 KB

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April fools! I wish I saw this earlier, I would have posted corroborating test results!
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Raj

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