[bear24rw]

Here is the patent for the control system i found a long time ago when looking to it.

It details the checksums as DCH style checksums. I have no idea to this day what that means. I remember looking for hours and not understanding it :/

I even had an excel sheet full of dumps that i was trying to analyze lol

And yeah power can go over the line too but i dont think you have to worry about it. when i was sniffing the data i had a rs232 splitter plugged directly into my computer.

BTW i think that the dashboard protocol and tether protocol are identical. so you can use the dashboard port to try to figure out the checksums

definitely let me know if you figure them out id be really really curious