How to Update the Data Rate Property in VeriStand SDF File?

Data Rate in VeriStand is how often the VeriStand communication loop publishes data to the gateway. Its default value is 15 Hz, which makes 67 ms delay between when data is acquired/written in the VeriStand Engine and when it is available in the API.

I have a requirement to change my data acquisition rate as 5 Hz, 10 Hz, 15 Hz, 20 Hz and 50 Hz in VeriStand, whereas the default data acquisition rate is 15 Hz.

How to update the data rate property in the SDF file?

Follow the below instructions to change the data acquisition rate in VeriStand Project.

1. Open the System Explorer of the VeriStand Project.
2. Now right click on the Project Name and choose “Show in Explorer.

3. Locate the SDF (.nivssdf) file at the location as shown below.

4. Open the file in a text editor.
5. Locate the tag "Data Rate". It will be set to 15, as shown below.

6. Set its value to the desired rate (i.e. 50). Note that the maximum value you can set this to will depend on the number of channels in the SDF, but 50 Hz shouldn't have any issues.

7. Save and close the .nivssdf file
8. When you deploy the system definition, it should now publish data at 50 Hz.

Note: A bench marking with systems running with 1000+ channels was able to stream at data to the host at 200-500 Hz.