Hello @jamesli ,
Thanks for your post. Could you please tell me which product you are using?
For your question, CAN connection is supported in SPSDK, so on command line only. It is not supported in GUI tool. Therefore there is not any CAN connection description in Manual of SEC tool.
Here is SPSDK documentation with the CAN support:
User Guide - blhost — SPSDK documentation

The CAN library is optional and it is not included in SEC tool. You need download SPSDK and build by his own. Or you can download blhost to use directly.
I will report to the relevant team to modify the webpage information to avoid confusion.
BRs,
Celeste
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