NI-USB CAN 8472s stand alone

[Intania 72]

I have  the 8472s for a while and have not got to the point that I can make it works by itself. Is that any way to config the CAN 8472s without connecting any Clock and trigger signals to the module ?

If you can, please give me an example VI ?

Thank you 

[Roryriffic]

Intania,

A great place to start with CAN programming is in the LabVIEW Example Finder.  In LabVIEW, click Help » Find Examples...  Search for "CAN" in the search tab to pull up the CAN examples.  CAN Basic.lvproj is always a good place to start, but some of the other examples might be helpful to you as well.  Try to get that working, then build your code around that.

[Intania 72]

Thank you for your reply. I would be really appreciate if you can tell me whether or not the 8472s works without physically connect any wire to the sync / clk terminals.

It seems to me that I need to somehow use the RTSI signal from a DAQ which I do not have at the momment.

Please advise.

[Gibson]

there is no need to use the Sync lines of your 8472s in order to get it running. Those lines are need only to sync the device with e.g. DAQmx device.

The 8472s is a Low Speed Device, are your device under test Low Speed nodes? What kind of problems are you facing with?

[Intania 72]

It should be a simple task; however, I could not make it works.

I have NI USB-8473 and 8472s, just simply connect them back to back (using cable and terminating resistors on both end). Then , I ran the CAN-transmit and CAN-receive VIs downloaded from the NI example and the rate is 125 Ks. Even I set it to 83.33 K, it does not work.

Using the same set up, if i use 8473 on both end, they work fine. 

What is my problem?  Also I ran the self test for the 8472 and it passed.

Thank you !

[GPIB_Guru · Accepted solution]

HS can and LS can use different physical layers that are not compatible. They do not refer just to the speeds that they can communicate. You would use the 8473 to talk to an HS CAN network and the 8472 to talk to an LS CAN network. You cannot mix HS and LS nodes in a single network.

[Intania 72]

Thank you. That is the part I did not aware of. Now I saw the article about the differences of the physical layer in  http://digital.ni.com/public.nsf/allkb/84210794086E9C0886256C1C006BE6AE .

So many times that I call NI and they thold me that they are compatible in the same network.

[GPIB_Guru]

I am sorry if you were given misinformation. That is not right. But, at least now you do have the correct information and can move forward. Thank you for your patience.