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The NI 9775 has three different acquisition modes: continuous mode, record mode, and advanced mode.
In continuous mode, the NI 9775 transfers real-time data to the chassis at an aggregate rate of 4MS/s across all channels. The NI 9775 will default to continuous mode after executing the Start I/O Node. You can configure the data rate through the Module Property Continuous Data Rate. The maximum value of the data rate varies based on the configuration, and can be found in the device datasheet at ni.com/manuals.
In record mode, the NI 9775 stores samples into onboard memory at up to 20 MS/s then transfers the data to the chassis at a slower rate. The start of the data collection is based on a trigger signal sent to the device. This signal can be digital or analog. The collected data is stored in the buffer until the entire acquisition is restarted.
In advanced mode, the NI 9775 combines the functionality of continuous mode and record mode to enable more complex triggering. Advanced mode can use live data from continuous mode to trigger a faster collection rate using record mode. This can be used for applications such as pattern detection or frequency triggering, and gives you more advanced triggering options.