Not being able to acquire data that the ECU requires a request for!!!! Any help/tips on how to solve this problem would be greatly appreciated.

[GRC5000]

I am using j1939. dbc file. I have a CAN card 9862 that connects to the ECU on the tractor. I am using examples provided Labview J1939 Frame output stream to send out data and J1939 Frame input stream to see the data.

When I'm running both VI. I get so many data and I can't tell which one is the one that I requested. Also, I am using bus monitor on NI-MAX to look at the data. I cannot tell which one is the one I requested either on the bus monitor because it is showing so many data. The bus monitor is not showing me the name of the data I want. For instance, I want to request data names hours (see attached file). When I use 00FEE5 as the identifier, I am not getting anything back. Also, I am using 254 as my node address.

Can someone please help?

[GerdW]

Hi GRC,

which attachments are you talking about?

• On an ECU CAN bus there are a lot of messages available. Usually I filter them by their ArbID…
• When you request for "data names hours" then you probably want to get a certain signal. All signals are transferred in messages, and you need to read/filter the messages by their ArbIDs…
• The bus monitor usually just shows the messages sent on the CAN bus…

Can you attach your DBC file?

[GRC5000]

Thanks GerdW for the suggestion. NI won't let me attach a dbc file. It says "the file type is not supported."

If you have an e-mail address, I can try to send it to you. However, I attached the information of the data "Hours" that I would like to request.

[RavensFan]

You can attach the file if you zip it up and attach the zip file.  (Note: an actual zip file,  not .rar. not .7zip, not anything that would require someone to download an extra application besides what is already built into Windows in order to unzip it.)