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docs: Note functioning canbus required even in bridge mode in CANBUS.md

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2025-04-29 13:02:34 -04:00
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docs/CANBUS.md
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@ -130,6 +130,15 @@ iface can0 can static
and the accelerometer all communicate via a single "USB to CAN bus"
interface.
* It is only valid to use USB to CAN bridge mode if there is a
functioning CAN bus with at least one other node available (in
addition to the bridge node itself). Use a standard USB
configuration if the goal is to communicate only with the single USB
device. Using USB to CAN bridge mode without a fully functioning CAN
bus (including terminating resistors and an additional node) may
result in sporadic errors even when communicating with the bridge
node.
* A USB to CAN bridge board will not appear as a USB serial device, it
will not show up when running `ls /dev/serial/by-id`, and it can not
be configured in Klipper's printer.cfg file with a `serial:`