common voltage test,3.3V power supply,common voltage :+3V,the connection is in figure 1 .
then I test CANH,CANL and CANH-CANL signals with Oscilloscope,I get figure 2 ,green is CANH signal ,
blue is CANL signal,yellow is CANH-CANL. The receiver overwrite the recessive ACK=1 , I find ACK is a little
strange,why CANH fall down ?