"Luis Moreira" wrote:
> Hi all,
> I am looking into a problem in a system that uses CAN, and have the need
> to "look" at the data flowing on the Bus. I do not need the
> functionality of those analyzers used in cars for resetting setting and
> so on, I just need to see the traffic on the bus and possibly later send
> some packets.
> I had a look at the CAN bus specification and I am looking at the bus
> now using one of microchip's CAN transceivers and a logic analyzer but
> is not the easiest of things to do Hence I would like to build my own
> CAN Analyzer. I have looked at the datasheet of the PIC18F2680 and it
> seem that if I set the acceptance filters to all zero it will accept any
> message, hence I could see all the traffic on the bus is this correct?
> Best Regards

Luis, you are correct, but in this case you would be better off with an 
off-the-shelf product. For instance, Lawicel makes a USB to CAN and RS232 to 
CAN converters:

http://www.can232.com/
http://www.canusb.com/

Someone told me recently that there are schematics and firmware available 
for a clone of this device. The protocol is very simple, and there is even 
some software available for it, including examples with source.

Vitaliy 

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