I have setup two chanels to send data from PC to micrcontroller. Both of them were working initially. Now one of the chanel does not work. WHen I dont send any data, Impedence between Can-H and Can-L is 120 Ohm on both chanels. WHen I send data, impedence of of the faulty chanel goes several order higher and status of CAN bus becomes passive.
My questions are
- What does it mean "CAN Bus is Passive"?
- Why does the impedence change when I send data?
I am using HI 3110 to interface can bus to micrcontroller.