Well, my first question would be, how to wire this thing.

I got a Banana Pi, which allegedly comes with a CAN bus interface.

However, when I look at the docs for the pin layout, I find RX and TX but not CAN_L and CAN_H.

See page 18 on the top.

So I am trying to understand what that means and how I am supposed to wire this the CAN bus of my heating system.

Regards,
Markus