Reading Measurement Data from TDMS Files

Query TDMS files to read measurement data.

What to Use

You can find the SystemLink TDM Reader and Configuration APIs on the Data Communications palette in LabVIEW NXG 4.0 or later.

• Open Configuration
• Create Filter
• Query TDMS Files
• Cluster Properties
• Listbox Properties
• Open File
• Read Data
• While Loop
• Event Structure

What to Do

1. On the client, create the following diagram in a VI to query TDMS file.

   Customize the gray sections for your unique programming goals.

   

   	Open Configuration initializes a connection with a SystemLink server or SystemLink Cloud based on the credentials you supply.
   	Create Filter creates or adds a query to an existing filter based on the criteria you specify. For example, in the VI above, Create Filter (Name) queries the TDMS files with "demo" in the name.
   	Query TDMS Files searches a SystemLink server or SystemLink Cloud for files matching the criteria configured by Create Filter.
   	Cluster Properties reads the TDMS files reference returned and provides the file IDs, which the Listbox Properties displays.
   	Index Array indexes the file ids with the file currently selected in the Matching File IDs listbox.
   	In the Case Structure, Open File opens references to matching TDMS files on your server or SystemLink Cloud. Note   The VI stores the clusters returned by Query TDMS Files instead of calling Open File again when the listbox selection changes.
   	Read Data returns the specified measurement data from the TDMS files, which you can visualize on a graph.

Troubleshooting