It would be so much easier to explain if I could post all my code but I will give it a try:d In frame (1)of the stacked sequence it uses the CAN to get the checksum value (this happened with no issues) In frame (2) the Boolean indicator for the true/false case structure that I posted a picture was true so that frame should execute In frame (3) the CAN device should be reading another value, but can't and get the error "Error -1074388956 occurred at Ni-CAN Write CAN Network Interface Object (ncWritenet.vi) Verify that he Open function succeeded. If in frame (2) the stop button or popup worked correctly then I shouldn't have even gotten to frame (3), at least this was my best guess. I am not surprised the Open function wouldn't succeed since I don't re-open the CAN device in frame (3) since it should already be open unless there is an error and then the above mentioned stop is in place. I am hoping you can give me some insight since this is stumping me bad!
-ncm