Jaguars not passing CAN communications

[Mike Copioli]

Originally Posted by jwakeman

I don't have one yet but I am trying to get one. What kind of diagnostics does it provide? It would give me some kind of indication of the quality of the network?.

The 2CAN LED will tell you if you have good CAN connectivity and whether or not you are communicating with the plugin on the crio (Ethernet connectivity). The web dash will show information on each Jaguar on the bus such as voltage, current, ID, temperature and throttle and allows firmware to be loaded onto the Jags.

In the mean time check your cabling, reduce your number of Jags on the BUS down to 1 until you are successful (I see you have already done this but this reduces the possibility that you have more than one jag on the bus with the same ID.) And yes the CAN bus will not operate without at least one 120 ohm termination resistor, although the BUS will work with only one you should have both in place at each end of the BUS as this is what CAN is designed around. If you are using 100 ohms that is fine as well. Even though the CAN spec and the TI data sheet for the CAN PHY both say it should be 120 ohms, using a 100 ohm resistor will probably work fine. Make sure you are not trying to write to Jags that are not present on the BUS as this will cause you pain and the -44087 timeout error.

I hope this helps.