Marker Output Signal

A marker is a digital pulse that NI signal generators can generate at specific points within a waveform generation. You can route this signal to connectors on the front panel or to PXI trigger lines or RTSI trigger lines depending on the device. You can place a marker in every sequence segment. A marker can be used as a trigger for controlling the timing of other devices in your application.

You can specify a marker by giving an offset count (in number of samples) from the start of the waveform buffer for each segment. If the waveform loops multiple times in a segment, the marker generates each time the waveform loops at the configured sample position.

If you need to generate a marker only once in a segment where the waveform loops a number of times, break the segment up into multiple segments. For example, if you need to generate a marker on only the first iteration of a sine waveform that loops 100 times, create a segment that generates the sine waveform with the marker at a specific sample position, and loops only once. Create a second segment that generates the sine waveform with no marker and loops 99 times.

This technique can be used in different combinations of segments to generate one marker every 10 of the sine waveform by creating a segment containing a marker and one loop followed by a segment with no markers that is looping nine times. These two segments are repeated as long as you need to repeat the cycle.