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Problems on 500Kbps
Charel
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02-09-2005 08:01 AM
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Hi everyone!
I started experimenting with CAN about 2 days ago and already have problems. I am using a PCMCIA CAN/2 card and PCMCIA CAN cabling with a notebook with Windows XP, LABView 7 Express and NI-CAN 2.1.3. I have connected the system to a vehicle and I can see the values in the Bus monitor in MAX when I set the baud rate to 500Kbps. Then I tried to do the same with using the CAN-Receive.vi example that comes with LABView. It is set up to use a baud rate of 125000 and with this setting it will obviously not read any information off the bus. Then I changed the baud rate in the setup window in the VI and it suddenly gave an error (Hex 0xBFF62005) and says that some attribute is not valid. I then changed the baud rate in every possible place that I could find in the VI and sub VIs and it always gives the same error message.
I do not understand how I have to change the baud rate if it is not possible to do so in the ncConfigCANNet.vi???
Could anyone tell me if I have been overlooking something, or is it simply something that I do not know because I am inexperienced with CAN?
Any advise will be greatly appreciated.
Thank you!
Charel Marais
I started experimenting with CAN about 2 days ago and already have problems. I am using a PCMCIA CAN/2 card and PCMCIA CAN cabling with a notebook with Windows XP, LABView 7 Express and NI-CAN 2.1.3. I have connected the system to a vehicle and I can see the values in the Bus monitor in MAX when I set the baud rate to 500Kbps. Then I tried to do the same with using the CAN-Receive.vi example that comes with LABView. It is set up to use a baud rate of 125000 and with this setting it will obviously not read any information off the bus. Then I changed the baud rate in the setup window in the VI and it suddenly gave an error (Hex 0xBFF62005) and says that some attribute is not valid. I then changed the baud rate in every possible place that I could find in the VI and sub VIs and it always gives the same error message.
I do not understand how I have to change the baud rate if it is not possible to do so in the ncConfigCANNet.vi???
Could anyone tell me if I have been overlooking something, or is it simply something that I do not know because I am inexperienced with CAN?
Any advise will be greatly appreciated.
Thank you!
Charel Marais
biker2000
Active Participant
02-09-2005 08:43 AM
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Hi Charel,
make sure that you use '500000' (or '500k') for a baud rate of 500Kbps. The NI-CAN driver knows only a few baud rates by the bit rate number, other baudrates need to be provided as BTR values. For more information on this, please take a look at knowledge base article # 0ZEF3MHR:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/cba1fc627ffa0f8f862564dc0071b3a7?OpenDocument
If that doesn't help, could you post a log file? You can capture all calls to the NI-CAN driver by running NI Spy at the same time. Open NI Spy (Start » Programs » National Instruments » NI Spy) and make sure that the NI-CAN API is selected (Spy » Options » View Selections).
Start NI Spy and then run the VI.
Regards,
-B2k
make sure that you use '500000' (or '500k') for a baud rate of 500Kbps. The NI-CAN driver knows only a few baud rates by the bit rate number, other baudrates need to be provided as BTR values. For more information on this, please take a look at knowledge base article # 0ZEF3MHR:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/cba1fc627ffa0f8f862564dc0071b3a7?OpenDocument
If that doesn't help, could you post a log file? You can capture all calls to the NI-CAN driver by running NI Spy at the same time. Open NI Spy (Start » Programs » National Instruments » NI Spy) and make sure that the NI-CAN API is selected (Spy » Options » View Selections).
Start NI Spy and then run the VI.
Regards,
-B2k
