CAN bus errors

[kevmi2ca]

I have an application that monitors up to 11 different DUTs at a time. My LabVIEW program utilizes the USB CAN device at 125k speed. The moment I connect more than 6 DUTs, the CAN bus starts to fault (error out) and will not read from anymore DUTs.

I can connect all 11 DUTs and run the CAN Test Panel in MAX with no errors. Any thoughts what might be happening??

Thanks,

Kevin

[nathand]

What's the fault or error message?  Are you trying to communicate with all of the devices simultaneously?  Do the devices all broadcast when connected, or do you need to address them individually?  Can you share your code?  Is there any possibility two devices are trying to use the same arbitration ID at the same time?  I currently have a system running with 12 devices on the CAN bus connected to a NI USB CAN device with no issues, so I doubt it's purely an issue of the number of devices.