Defective Black Jaguars?

[byteit101]

We know it is not the cables, we were playing around with a bunch of them and they all work. It is also not the ID. connecting directly to any of the bad black jaguars works, its their communications in and out. signals pass through them when they are not the first on the bus.

[dyanoshak]

My procedure from before is to help guarantee that it isn't the cables or the ID. I know that on my teams robot, we can't guarantee that a cable is good until we've tested it them in an environment where it is the only variable. Same goes for the IDs.

As a mentor, I know for a fact that the state of cables and Jaguars one night might not be the same the next night because there are some pretty eager students out there. All it takes is a student to think they have a problem, and the best solution is to reset the Jaguars to factory defaults (ID 1).

Can you move the Jaguars to different places in the network, leaving the cables in the same place. For example, try different combinations like this:

[Jag A (black)][Cable 1][Jag B (grey)][Cable 2][Jag C (grey)][Cable 3][Jag D (black]...

[Jag A (black)][Cable 1][Jag C (grey)][Cable 2][Jag D (black)][Cable 3][Jag B (grey)]...

[Jag D (black)][Cable 1][Jag B (grey)][Cable 2][Jag A (black)][Cable 3][Jag B (grey)]...

Does the failure move with the Jaguar or does it stay at the same place in the network? If the failure moves, this could help eliminate the cabling.

-David

[kamocat]

From the information you've provided, it sounds like the Jaguars in suspect work, but just don't support CAN.

Are ALL your black Jaguars like this?

Could you update their firmware again, and see if that changes anything?

[IanG]

We had an issue like that on 2 different black jags. We just flashed the firmware again and they worked fine

[byteit101]

I know this is old, but I want to post my (odd) results.
When we re-flashed them, they worked fine, and I forgot about this for a while, until I flashed one again, and it did not work. After some testing I discovered this pattern:
Flash -> works
Re-Flash -> does not work
Re-Flash -> works
Re-Flash -> does not work
Re-Flash -> works
Re-Flash -> does not work
Re-Flash -> works
Re-Flash -> does not work
etc...

[kamocat]

It appears that re-flashing a working Jaguar will fail, causing that Jaguar to not work. Maybe something to do with the bootloader.

[PAR_WIG1350]

If this pattern is the case for all jaguars, I would think that the manufacturer would want to know about this since it seems like a resolvable issue (even if the solution is just to release a notice to users about the existence of this phenomenon).