I am suffering a problem with a SNAP-SCM-CAN2b module we have installed. It receives data and has no errors (including status LEDs) and the data is well formed (i.e. not scrambled or garbled) the problem is that the data has a 28 second delay. I got this delay by comparing the data arrival time to the data coming through a separate CAN bus USB adapter.
I suspect I have misconfigured something, perhaps related to the buffering in the CAN bus reader but I can't work out what that is. Maybe I am not reading it quickly enough so that its buffer is filling up?
Everything else about the PAC works fine. It is running several charts but they all appear to be working fine too.
I am communicating with the PAC over ethernet, however separate experiments have confirmed that the PAC to computer communications delay is under 40 milliseconds.
It's a mystery to me because once I get the data it's fine, it's just that it takes a long time to get there.
Thanks in Advance