The second frame lost in CAN communication when use NI PCI-CAN/XS2 card

I got a trouble on CAN communication recently.
I need to commmunicate a Cluster with CAN BUS,the baud rate is 500kBPS,the CAN card is NI PCI-CAN/XS2. The operating system is Windows XP.
normally,the PC send a command to Cluster,then read back a frame of data from the Cluster,but for some commands,the Cluster will return two frames of data,and the programe on PC cannot receive the Seconds frame,it lost.
I searched the forum,most of the reslut is the error about CAN BUS overflow,which make the CAN frame lost,but there is not any error report on my programe,and the baud rate is no that fast,I also use another port of NI PCI- CAN/XS2 to monitor the CAN bus,the second data frame never appear,when I replace NI CAN card with Vector CanCaseXL(CAN card) ,and call CanCaseXL's DLL in labVIEW,it can get the second CAN frame,the monitor of Vector CanCaseXL can get the second data frame too.
so,is there some software/hardware configuration need to be done to get the second data frame?
the attached pictures are NI-CAN/Vector CAN monitor and CAN init/write&read in my programe.
Any reply is appreciate!!! thanks
帖子被iwanttofly014在 12-12-2009 07:41 PM
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帖子被iwanttofly014在 12-12-2009 07:43 PM
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Solved!
Go to Solution.
Attachments:
NI CAN monitor.jpg ‏165 KB
Vector CAN monitor.jpg ‏58 KB
CAN init.jpg ‏80 KB

Thanks your code.
I try the code you posted, It still no work, I found you has improved the "Get data.vi",It works better,but the second frame still no shown.
I used the NI CAN monitor in MAX to monitor the CAN bus,there is no second frame shown in the monitor,See attach pictures.but It shown in the Vector CAN monitor and the code call the Vector DLL.
Have a great day.
帖子被iwanttofly014在 12-16-2009 08:02 PM
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Attachments:
LabVIEW VS Monitor(Vector CAN).JPG ‏70 KB
LabVIEW VS Monitor(NI CAN).JPG ‏40 KB

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