DStar does not work

[leon43]

My setup is:

- PXIe-1082 chasis

- PXIe-7962R FlexRIO

- custom MRF timing card

I want to send data via the DStarB line from the custom FPGA to the FlexRIO. I am reading the DStarB line in my LV FPGA program.

The problem I have is that I only get the data when the DStarB line goes from '0' to '1'. If I send two '1' after another I only get the first one, because I only recognize the positive front. I would wager that the backplane has a setting for this DStar lines. Some pull-downs or something...

Do I need to enable something in the chassis settings in NI MAX? I went over everything but cannot find something useful.

Do I need to configure the backplane with my timing card somehow?

I am running out of ideas, so please do help.

[leon43]

I did a bit of digging. I cannot read the VI_ATTR_PXI_DSTAR_BUS and VI_ATTR_PXI_DSTAR_BUS_SET attributes of the PXIe-7962 card from the LabVIEW program. The attributes are also not present in the VISA Interactive control Attributes list.

Is there a problem, because the crate is not configured to work with my custom timing card?

Or is the problem in the FlexRIO configuration?