Thanks for the quote out of the manual. I found the same information not too long after you posted this message.
Quote:
Originally Posted by MetaEngineer
I'm curious to know what custom devices you intend to build, if you don't mind sharing 
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We've enjoyed using CAN bus for Talon's and the added support for sensors on the Talon's have simplified wiring and programming.
We would like to build an interface to a Raspberry Pi. We have a vision program operating nicely with the Raspberry Pi. We'd now like to get the data to the RoboRio.
Ethernet is a common suggestion, but the Ethernet interfaces on the robot are limited. Adding the Pi to Ethernet would take up bandwidth as well as likely require the addition of a switch (weight, space, ouch).
I'd like to hear the benefits of other interface choices.
I'm also on the lookout for examples of using the CAN interface on the RoboRio.