Digital Clocked Operations

With clocked operations, you can acquire or generate clocked signals at a specified scan rate for a specified duration or number of scans. These operations use hardware timing to acquire or generate at specific times. The operation is controlled by events tied to subsystem clocks. In a clocked acquisition, data is transferred from the device to your system memory and displays when the event calls for the data. In signal generation, data generated from the device is stored in memory until the configured event occurs. When an event occurs, data is sent via the digital channels to the specified devices.

Your device might or might not have an onboard clock. However, Data Acquisition Toolbox™ does not support direct access to device onboard clocks for clocked sampling when using only digital input/output channels with a DataAcquisition object. You can enable clocked operation by adding a clock in one of these ways:

Import a clock from an external source. See Acquire Digital Data Using an External Clock for more information.
Generate a clock from a Counter Output subsystem in your DataAcquisition and import that clock. See Acquire Digital Data Using a Counter Output Channel as External Clock for more information.
Share a clock from the analog input subsystem. See Acquire Digital Data Using a Shared Clock for more information.