Electrical Engineering

I have a PIC18 and I'm trying to detect whether it is connected on the CAN bus or not.

When the PIC is not connected on the bus, and I load the transmit buffers, after setting the TXREQ flag. The transmission does not start. This is also mentioned in the datasheet:

However I cannot find a reliable way to detect that the PIC is not plugged into a healthy bus.

The only thing I can think of is polling the TXREQ flag for a few milliseconds to check if the peripheral initiated a transmission or not.

But I'm not sure if that is a reliable algorithm. If yes, how much should that timeout be? 1ms or 100ms?

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CAN bus open circuit detection

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