We need a can bus communication. I’ve tested the GHI example (NETFM 4.1 SDK) with 2 USBizi – and 2 SN65HVD235 transceivers. The write example runs on USBizi 1 and the read example on USBizi 2. To differentiate the two, the LED went on each time if data was sent. No errors occurred, but there didnt arrive any data if I set the breakpoint in the read event. In the next step I measured the voltage on CAN1 TD during data send. There is a constant voltage of 3.3 V, no peaks. The same procedure works in the SPI example on pin 11 and 13. Is it a normal state on CAN bus?