NI-DAQmx Properties

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Product DocumentationNI-DAQmx Properties...NI-DAQmx PropertiesDAQmx ChannelCounter Output:General Properties:More:Advanced:Data Transfer and Memory:Data Transfer Mechanism PropertyCurrent page
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Counter Output:General Properties:More:Advanced:Data Transfer and Memory:Data Transfer Mechanism Property

Counter Output:General Properties:More:Advanced:Data Transfer and Memory:Data Transfer Mechanism Property

Short Name: CO.DataXferMech

Property of DAQmx Channel

Specifies the data transfer mode for the device. For buffered operations, use DMA or USB Bulk. For non-buffered operations, use Polled.

DMA (10054) Direct Memory Access. Data transfers take place independently from the application.
Interrupts (10204) Data transfers take place independently from the application. Using interrupts increases CPU usage because the CPU must service interrupt requests. Typically, you should use interrupts if the device is out of DMA channels.
Programmed I/O (10264) Data transfers take place when you call DAQmx Read or DAQmx Write.
USB Bulk (12590) Data transfers take place independently from the application using a USB bulk pipe.

Remarks

The following table lists the characteristics of this property.

Permissionsread/write
Resettableyes
Settable while task is runningdevice-specific
Available in Run-Time Engineyes
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