How to transmit frames CAN cyclically inside a loop obey the emission data informed BCD?

Hi all!

I don't know if I don't completely understand the behavior of the situation below. I use LabVIEW 2014 and PXI-8513 card under Windows.

NOR-XNET help reading I understood:

Cyclical data : the data frame transmitted cyclically (periodical). The period is defined in the "transmission data" field in the properties BOX of the framework in the DBC file.

But how the transmission time can obey informed transmission data in DBC file if I call the XNET write VI in a loop with a waiting inside? I don't know if I fully understand how it works in a while loop.

I watch the program below, how writing would behave?

While the loop contains a "wait until the next multiple ms" 100 and the signal selected database (dbc) has a transmission time of 0.02 s (20ms), how many times would the framework passed in the first loop?

If your answer is "Although the time of transmitting the frame is 0.02 s in this case writing is written only once", I have another question: How can I keep a loop writing frames obeying the time of transmission of the image of the CBD? Consider that I have signals selected different frameworks at different times to transmit.

Thanks in advance!

When you use the XNET write Point with Single mode, it updates the value that will be transmitted according to the schedule specified in the XNET (DBC file) database. If you call multiple entries before the frame was transmitted, only the last value written shuts down during the NPC.

If you look in the help file XNET under the API OR-XNET for LabVIEW-> Sessions-> Modes of Session, you will find information, including an example of how it works.

In your example - if you have a timing loop of 100ms, but your message cyclic time is 1s, then will send you only the last value of 'editorial' more message cycle time. If your timing loop is 100ms, but your message time is 10ms, so you pass the value even 10 times (about... windows calendar and all that).

In essence, you CAN transmitting frame continues to run in the background according to the time where you specified in the DBC file, but you can then update the values which are transmitted asynchronously using the single-point VI write.

If you want to check the values passed are updated every time - you must use the stream or queue mode and your frames to the output of the buffer. That, or you must use a RT target that can update the data in a deterministic way.

Tags: NI Software

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