X-can sample project

Hey guys,
I´m getting started with the myRIO-1900 and try to connect it with my car via X-CAN module with OBD-II BD9 cable to collect and record data from my car.
I've installed Labview 2014, X-CAN, realtime module in my computer without any problem.
When I connected myRIO 1900 and X-CAN module with my Mercedes, launched "X-CAN for myRIO" under "sample project", it worked successfully and I can read data from Labview.
Question: What do all the data read mean in the labview, eg. what does identifier means and what does payload means? At first I thought they might be PID codes, but after browsing all the info online, I felt the data are not PID codes because they should start with P01 or P02. Is there a manual for me to review and learn? Or is there a weblink that can tell and translate these codes?
Here is a snapshot of the result. Appreciate for the help.

HI lichlich1,
I'm glad that you were able to get the example to run and read in values! That indicates that your NI hardware, drivers, and your program are working.
The identifier is an ID from the device you are interacting with. In this case, it's probably the car's ODB controller. As for the payload, that is the actual data sent by the car to your program. It looks like it's displayed in hex.
As for the meaning of this data, that might rely on Mercedes. I would recommend looking for ODB codes. A quick search turned up this page as well as this more specific page of codes.
Hope this helps,
Andrew
Andrew T.
Application Engineer

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X-CAN sample project problem

Hey guys,
I´m getting started with the myRIO-1900 and try to connect it with my car via X-CAN module with OBD-II BD9 cable to collect and record data from my car.
I've installed Labview 2014, X-CAN, realtime module in my computer without any problem.
When I connected myRIO 1900 and X-CAN module with my Mercedes, launched "X-CAN for myRIO" under "sample project", it worked successfully and I can read data from Labview.
Question 1: What do all the data read mean in the labview, eg. what does identifier means and what does payload means? At first I thought they might be PID codes, but after browsing all the info online, I felt the data are not PID codes because they should start with P01 or P02. Is there a manual for me to review and learn?
Question 2: Do you guys know how can I record all the data that read from my vehicle and export them to Excel file? I tried to add "File I/O" and "Measure to write" followed by the instructio online, but there was not excel file generated after the run. Any suggestions?
Here is a snapshot of the project result. Appreciate for the help.

There is TONS of documentation on CAN buses. From various hardware and software implementations and a bunch of other variations that can make working with it difficult.
On the surface everything is easy, you just read and write frames, as described here
http://en.wikipedia.org/wiki/CAN_bus
Frames are just raw data that you can then do things with. A frame consistes of an ID which identifies the message and also does things like sets priority of the message. Then the payload is 0-8 bytes (excluding CAN-FD). These 0-8 bytes are the usable parts of the message. Protocols have been written to support multi frames, and request reply, among several other features not supported in the hardware.
Basically you have a lot of reading to do. Find all the documentation you can on CAN and how it works knowing that it starts at the frame level which is what you get. You might even get something out of the first few slides of a recent presentation I did on CAN and XNET.
https://decibel.ni.com/content/docs/DOC-41749
As for recording the data. The most common way is to format it into a 2D array of string, and then use the write measurements to file, or write spreadsheet to create a CSV file that Excel can open. There are other options that are usually more messy, but can be done.
EDIT: Oh and you might get better support from CAN related questions over on the Automotive subforum.
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