What 's the meaning of "sample rate =-1" when to use the CAN init.vi?

ALL,
I saw a kind of use to CAN init.vi where The mode = "output recent" and the sample rate = -1. I check the NI CAN help document, it seems that the sample rate must be large than 0 when the mode = output recent. So,here,why the sample rate can be -1? What does it mean?
Thanks!
Lai

I found that it is different whether to use "-1" or ''0" to sample rate. In CAN init.vi, there is an input parameter filepath which is used to load the ncd file or dbc file. The ncd file can't set the sample rate of CAN message, but dbc file can. When I use sample rate = -1 and dbc file , the period(=1/sample rate) of CAN transmission equals the Sample time defined in dbc file and is not determined by loop time in LabVIEW programm. But when I use sample rate = 0, the period of CAN transmission equals the loop time in LabVIEW programm. So I guess the period of CAN transmission is determined by the Sample time defined in dbc file when use sample rate = -1. Is that true?

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