How to Identify Correct CAN Message ID for RPM (PID 0x0C) with MCP2515 Controller?

Hi all.

Getting back to my CAN BUS issues. I am guessing that my problem is that I don't know
the message ID for RPM. There fore I cant set up my filters / masks properly.
0x0C is the PID for rpm and I thought this is the message ID and I have been using this value. With a lot of internet searching I came across 0x00000201 as a CAN message ID for RPM. Now I am confused. Where does the 0x0C fit in? I haven't tried the 0x00000201 yet
as it got late. I will try ASAP. I know this could still be wrong as I don't know if this is interchangeable between vehicles. Any way my question is: Where do I use the 0x0C
PID for RPM if? Is this used as the Message ID as I thought until I came across 0x00000201?

I am also thinking I might be at a dead end if the CAN Message ID's are secret from the
auto manufactures. I guess I could scope the BUS but I would not know which is the one I want as I believe the BUS is full of activity. Major trial / error.

Thanks,
Dennis

I guess I just answered some of my own question. I send out the 0x0C to request
RPM data. But again, I need the right CAN Message ID to set the filters / masks up
properly to receive just RPM. The only question I have here is : Do I send out the
command 0x01 with it ( 0x010C) to request current data?

Thanks again,
Dennis

Hi, are you intend to build OBD interface and its program?
You should be observe the standard bytes.