... before I got it working with RAILUINO CAN library. The extra STBY pin must be set to LOW (normal mode) and not leave floating. Also had to edit RAILUINO CAN library defaults.h to set the ARDUINO pins not according to UNO but PRO MINI. ARDUINO IDE must be set to processor ATmega328P (5 V 16 Mhz) (PRO MINI). Greetings from Finland. (Not a native English speaker... :-)
I have it paired with an Sparkfun ProMicro and it is working fine. My only complaint is that the STBY pin of the transceiver section is tied to the microcontroller pins instead of using one of the GPOs of the protocol controller section.