3 ms·
Many cars, especially the smarter kind, have multiple CAN buses. A CAN bus is relatively low bandwidth by today's standards, so manufacturers have had to resort
by AceJohnny2 12y ago
Many cars, especially the smarter kind, have multiple CAN buses. A CAN bus is relatively low bandwidth by today's standards, so manufacturers have had to resort to splitting them up to increase effective utilization, (which also leads to its own problems when a device on Bus 1 needs to talk to a device on Bus 2).
I would expect this user-accessible (give-or-take the connector) bus is only the monitor/dashboard bus, to avoid possibly fucking up the timings on the more loaded and critical buses.
- Shivetya 12y agoOn many motorcycle brands the CAN bus solved the age old problem of buyers having to find same spots to splice into for accessory and lighting power. Now the CAN bus that controls runs separate from power making power take offs much easier and safer
- antoinealb 12y agoApparently busses are connected via gateways: https://www.youtube.com/watch?v=7h7LWeET1fI https://www.youtube.com/watch?v=7h7LWeET1fI
- Matthias247 12y agoThey are - but they don't forward all messages. All gateways are configured in detail which signals should be forwarded from Bus A to B and which transformation functions should be applied. This means you won't get access to any signal from any bus.
- AceJohnny2 12y agoYeah, I know of at least one company who spec'd their gateway module for something like 20% message bridging, but expanded use mean they're way beyond that and facing the limitations of their original design. :)