CAN Interface Configuration

[Cedric 99]

1)PCI CAN Interface (HiSpeed) can operate with for about 50 frames (Rx-Tx).
Do you now a way to configure more objects?
2) How can I cancel 1 frame update when configuring the object to transmit Data periodically without RTSI Configuration?(NcAction allow to stop the object, but when restarting it, Periodicity is lost).
3) How can I transmit 13 frames running with 13 transmit periods using RTSI Configuration (on the same device)?
4) Why is it impossible to deliver an external clock with RTSI (1Khz for example), and configure the objects to be sent periodically with a sub-frequency of the external clock?

[Randy Solomonson]

1) A CAN Network Interface Object can be used to receive can data to all arbID's to one object. CAN Objects must still be used to transmit.

2) Stopping and restarting in this manner introduces an unknown latency from the operating system. Is there a reason for transmitting in this manner? LabVIEW real-time might be a better option.

3) It is possible to setup 13 objects to transmit periodically. However, the RTSI connection may be difficult.

4) Dividing a clock in such a manner would require additional hardware on the CAN card or maybe another DAQ card connected to the RTSI line.

These are very interesting questions. I'd really like to hear more about the application and complications you've found. We could probably come up with
some creative solutions after getting more details. Feel free to contact us through ni.com/ask. Email support provides a better response system.

Randy Solomonson
Application Engineer
National Instruments