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I have a USB CAN Converter Basic as described here: https://ucandevices.github.io/uccb.html

When I plug it into my Arch Linux laptop, dmesg shows the following:

usb 1-6: new full-speed USB device number 12 using xhci_hcd usb 1-6: New USB device found, idVendor=0483, idProduct=5740, bcdDevice= 2.00 usb 1-6: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-6: Product: CAN_USB_ConverterBasic usb 1-6: Manufacturer: CANDevices usb 1-6: SerialNumber: 00000000001A cdc_acm 1-6:1.0: ttyACM0: USB ACM device

lsmod shows the following entries:

slcan 16384 0 can_dev 36864 0 can_raw 20480 0 can 24576 1 can_raw

When I now try to activate the CAN interface with sudo ip link set can0 type can bitrate 500000, I get the error Cannot find device "can0".

I think I have to add some udev rule or systemd thingy. But I cannot find the right start to do so.

Update:

I have now created a udev rule:

# cat /etc/udev/rules.d/45-uccb.rules SUBSYSTEM=="usb", ATTRS{idProduct}=="5740", ATTRS{idVendor}=="0483", MODE="666", SYMLINK+="can0"

...but I can still not use the ip link command above.

Can anyone give me a hint on what's missing?

Thanks.

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1 Answer 1

Reset to default
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The UCCB adapter introduces itself as a serial device (/dev/ttyACM0) so it has to be set up as slcan device.

slcan_attach -f -s5 -o /dev/ttyACM0 slcand ttyACM0 slcan0

With that, ip link can configure the device and can0 can be used by candump and friends.

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