Cannot read 7 bytes long LDF signals

[biroo]

Hello,

I am using the XNET drivers and I am trying to extract signal values from a frame that is defined inside a LDF file. It usually works except I have this signal that is 7 bytes long and Labview doesn't return it as part of the frame. The frame has 4 signals, and Labview only returns 3 of them. If I change the signal length to, say, 4 bytes, I get all 4 signals. Does anyone know why this happens and how can I fix it? The signal needs to be 7 bytes long.

Thanks.

[Gibson]

As NI-XNET signals are implemented as Doubles you can handle signals up to a size of 52bits only.Eg if you try to display those signals in the XNET Database Editor you will get a warning.

If you need signals larger than 52 bit you may need to use a Frame Session instead and convert the payload into a eg u64 and go from this.

[biroo]

Hi, Gibson,

Thank you for your answer. The problem is that I need to use the signal before I open any session, just by accessing the LDF file.