CAN error with Channel API

Hello All,
Right now i am facing a CAN error when run my script which was developed using channel APIs. I am not able to trace out the the reason of the error. Pls find attached code and Error description. I have uploaded the sample code here and I am writing several messages in the same VI as same like in the code. Pls guide me in this
Thanks in advance
Anoop
Attachments:
CAN Channel API error.JPG ‏22 KB
Channel API test.vi ‏29 KB

Hi Anoop,
Is the code you posted the exact code you are using when you get the error? The reason I ask is, usually this error is associated with using the Set Property VI after the interface has already been started, such as in a loop.
Are you able to use any examples from the Example Finder successfully? (Help > Find Examples) You can Browse to CAN examples by clicking Hardware Input and Output > CAN > Channel API.
Hope this helps!
Adam W
Applications Engineering
National Instruments

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you checked for examples?
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CAN program using Channel API receives only 0

Hello everyone,
I'm get in stuck. I'm currently programming CAN interface for a transmission using PXI, Channel API and a .dbc file.
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Attachments:
All signals and values.vi ‏22 KB

Hi Yuta
What I am expecting is that the sample rate is being set to high. When using the multiple channel - single sample instance of the CAN read vi, it will return a single sample for every period. The number of samples to read input is actually ignored and it will return a single sample for every channel specified. Therefore, if no data has been received within the sample period specified with the sample rate, it will return the default value as specified in the database file.
Due to the high sample rate, it might be that data is being received, but aren't visible on screen since they are quickly being overwritten by new (default) data. I suggest trying to use the Multiple Channels - Multiple Samples instance of the CAN Read vi to see if you receive values in this case. Or you could try lowering the sample speed (note that sample rate is not the same as CAN baud rate).
Also, make sure you are properly reading the data already in MAX's test panel as this would indicate if the database file is loaded properly.
Best Regards
Michiel
Applications Engineer
NI Belgium
http://www.ni.com/ask

CAN program using Channel API doesn't receive data

Hello everyone,
I'm get in stuck. I'm currently programming CAN interface for a transmission using PXI, Channel API and a .dbc file.
CAN configuration based on .dbc file is downloaded to PXI by MAX.
The problem is that it receives 0 for all the values by Channel API based program (Attached file), though it seems receiving meaningful data when I check raw data by Frame API based program.
Baudrate, CAN port, and .dbc file are correct.
thanks!
Attachments:
All signals and values.vi ‏22 KB

Hi Yuta
What I am expecting is that the sample rate is being set to high. When using the multiple channel - single sample instance of the CAN read vi, it will return a single sample for every period. The number of samples to read input is actually ignored and it will return a single sample for every channel specified. Therefore, if no data has been received within the sample period specified with the sample rate, it will return the default value as specified in the database file.
Due to the high sample rate, it might be that data is being received, but aren't visible on screen since they are quickly being overwritten by new (default) data. I suggest trying to use the Multiple Channels - Multiple Samples instance of the CAN Read vi to see if you receive values in this case. Or you could try lowering the sample speed (note that sample rate is not the same as CAN baud rate).
Also, make sure you are properly reading the data already in MAX's test panel as this would indicate if the database file is loaded properly.
Best Regards
Michiel
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http://www.ni.com/ask

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Does the NI-CAN 2.5 Channel API support multiple periodic tasks?

I have different channels that need to be output at seven different periods. Can I create multiple periodic tasks with different periods or am I going to have to either use software timing or the Frame API?
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Endigit

Hi,
yes you can initialize multiple task with different sample rates, but you have to initialize all sequentialy and then to start thee tasks sequentialy.
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DirkW
Attachments:
CAN_Multi-Chans_Diff-Period.vi ‏26 KB

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Edited by: 791979 on 31 août 2010 10:44

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I resolved it. We are switching over to SP6, Patch 1 and the listener code works fine with this version of the Java API.
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(...please continue on part 2)

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

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Hi All,
I need your suggestions on the application i have attached here with in the post.
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Attachments:
main_app.vi ‏26 KB
Send_Periodics.vi ‏32 KB
stop_periodics.vi ‏5 KB

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Hi, in my project we need to send messages(PGNs) of J1939 format onto the microcontroller device and receive the response from the same. I have tested the microcontroller with the NI CAN software using MAX and it is working fine. Now I have to develop a LabVIEW application to send and receive the commands. I have used the "CAN write.vi" (Channel API) to send the CAN message. By using the "CAN Create message.vi" I am able to configure the PORT, Arbitration ID, Data length (8 bytes in my case) etc. But I dont find the field where I can fill in my data (8 bytes) in hex format. Presently I have put my data in the "Single-chan Signle-samp dbl" input field of the "CAN Write.vi". Please let me know where I need to fill in the data values.
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Regards,
Krishna.
Attachments:
CAN_Test.vi ‏92 KB

Hi Kittamma,
You wrote, that it worked with the Max and now you are using the create channel function. Is there a reason not to take the channel database? To have control about every databyte, the only solution is to create or have one channel for every databyte and to write all channels together in one task. The data has to be wired allways to the write VI.
But keep in mind, if you have allready a databasefile or configuration in MAX, you can take the Init or InitStart VI and this VI takes the configuration automatically from MAX or your file.
DirkW

CAN error with Channel API

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