How do I know when CAN Read returns valid data?

[buff]

I ran into a situation today where I initialized a task for input and then read the task prior to the channel data being present on CAN.  The CAN Read completed without any errors and returned a value of 0 for the channel data.  If I didn't know any better, it would appear as though the channel data I was attempting to read had a value of 0.  Is there a way to allow a CAN Read to occur only if there has been a received message which contained the channel in the channel list?

thanks.

[DirkW]

Hi,

You could use the timestamped input, to get only the frames really arriving on the bus. In this case the sample rate input will be ignored.

Or you could define a value different from zero for the channel default value, so you will know that it is the default value.

DirkW