I/O Trace is an application that monitors, records, and displays National Instruments API calls made by applications. Use I/O Trace to quickly locate and analyze any erroneous National Instruments API calls that Switch Executive makes and to verify that the communication with your instrument is correct.

To launch I/O Trace, navigate to Start»All Programs»National Instruments»IO Trace.

To begin monitoring or capturing API calls, press <F8>. To end capture, press <Ctrl-Break>.
Tip   Double-click a function in I/O Trace, or right-click and choose Properties, to display a dialog box with more information about the inputs and outputs of the function call.

I/O Trace Monitoring NI Switch Executive Function Calls

Tip I/O Trace supports two buffer sizes. The default buffer size, brief, only allows 64 characters in any of the string fields. To view full error descriptions and string inputs and outputs, it's recommended using the full buffer option.

For more information about using I/O Trace, refer to the I/O Trace Help, available in NI I/O Trace at Help»Help Topics.