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2.2 USB-A Port
U2C v1.1 has 2 more "CAN transceiver + USB-A" than v1.0, which makes it
convenient to connect the motherboard directly with USB data cable.
NOTE：
1. USB GPIO of the motherboard needs to support CAN
feature(e.g."PA11/PA12" of Octopus)
2. The signal protocol on the USB data cable of this connection mode is still the
TTL level signal of MCU rather than the differential signal of CAN, so the anti-
interference ability is not strong. Please avoid using too long data cable and avoid
being close to places with strong signal interference.
The jumper of the Vbus in the figure is the power supply jumper of the CAN
transceiver. When the USB of the motherboard cannot provide 5V power supply
to U2C in reverse (e.g. Octopus), it is necessary to insert the jumper of the Vbus
to use the 5V of U2C to supply power to the can transceiver. Vbus-1 corresponds
to the lower USB-A port, and Vbus-2 corresponds to the upper USB-A port. The
jumping of 120R corresponds to the terminal resistance of two CAN transceivers
respectively.
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