incorrect data CAN TX

Hi Sir/Madam,

I am a rookie in Labview and I hope someone can help solve my problems. I would like to create a labview program to send periodically CAN message with the ID of 18FF6500 arbitration in every 100ms and I started my programming by changing the code samples in the help files. Attached is my VI and it does not send the data according to the input data. (1) can be used (ncConfigCanObj.vi) and (ncConfigCaNNet.vi) in the same VI? 2) from the code example NOR why arbitration IDS must AND with 1FFFFFFF before it enter the format of string? (3) what's not in my vi?

Hoping to hear from you.

Kind regards

Rookie.Alfred

The reason for the AND with 1FFFFFFF is that arbitration IDS are 11 (standard) or 29 bits (extended).  In this case, you use a 29-bit identifier.  1FFFFFFF is a value with 1s in the low bits 29, so the masks AND the higher order bits that would make arbitration ID not valid offshore.

Get you to the error messages that might help indicate your VI does not work why?  If an error occurs, it should appear in a dialog box when you press the stop button.  Sure you have the name of your device CAN correct?  You can find and value, the name in measurement and Automation Explorer.  NI-CAN device do you use?

Your VI attempts to open a NI-CAN object, but it uses the network interface of the write.  You must decide that you want to use.  If you do not need the interface of the object, you must pass your CAN directly Interface name (without arbitration ID, etc.) to ncOpen.  If you want to use the interface of the object, you must use ncWriteObj inside the while loop, instead of ncWriteNet.  Read the help for the differences between object and Net to the NI-CAN interfaces.  Better yet, if you use a more recent CAN device that supports XNET, consider using that.

Tags: NI Software

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