I'm trying to set a CAN Communication between an MCU (Inside Renesas board that have a CAN interface inside) and CAN Transceiver (Vector CANcase) which is connected to my laptop via USB.
I want to check if the communication is passing (If frame messages are being transmitted / received) in the bus.
I found that I have to check the CAN_H / CAN_L signals using an oscilloscope but i need to know the circuit / wiring.
Since i have to measure the differential : Do i need to use a separate channel for each and then use the oscilloscope to substruct one from the other (I have Tektronic MSO 2024B wich is supporting Math function) ?
From what I have understand when a communication is running I should read CAN_H = 3.5V and CAN_L should be 1.5 and when not the difference should be 2.5 .
I have another question: the MCU gives the possibility to output CAN Tx/Rx signals in GPIO pins: How can I measure them in this case : should be the same as CAN_H and CAN_L (Altough I don't know the difference between CAN Tx/Rx and CAN High/Low)
Please share your suggestions on how to do this :) Many thanks.