Question about returning GPS Time Using PXI-6682,NI-Sync and LabWindows/CVI ???

[susan_2012]

Hi!
My system consists of PXI-1042,PXI-8108,and PXI-6682,GPS antenna,and so on.
I want to obtain the precise UTC by using PXI-6682. The time precision I need is microsecond.

The following is my program:

    niSync_init ("6682", VI_TRUE, VI_FALSE, &vi);
    niSync_EnableGPSTimestamping (vi);
    niSync_ReadLastGPSTimestamp (vi, &timestampSeconds, &timestampNanoseconds, &timestampFractionalNanoseconds, &gpsSeconds,       &gpsNanoseconds,

&gpsFractionalNanoseconds);
    niSync_DisableGPSTimestamping (vi);
    niSync_close (vi);

But now I am confused.

1.Can you tell me please the the meaning of the parameters of the function niSync_ReadLastGPSTimestamp?
2.The value of the gpsSeconds is very large. And gpsNanoseconds is zero. I want to know what's the meaning of it.
3.Can I estimate the precise UTC through gpsSeconds,gpsNanoseconds? How should I do?

Thank you for any help.

[AlejandroZ]

Trying to keep a single thread for this topic.

Question answered here:

http://forums.ni.com/t5/PXI/Question-about-returning-GPS-Time-Using-PXI-6682-NI-Sync-and/m-p/1914317...