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Chapter 2
Function Reference — DAQ_DB_Config
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National Instruments Corporation
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NI-DAQ FRM for PC Compatibles
DAQ_DB_Config
Format
status = DAQ_DB_Config (deviceNumber, DBmode)
Purpose
Enables or disables double-buffered DAQ operations.
Parameters
Input
Parameter Discussion
DBmode indicates whether to enable or disable the double-buffered mode of acquisition.
0:
Disable double buffering (default).
1:
Enable double buffering.
Using This Function
Double-buffered data acquisition cyclically fills a buffer with acquired data. The buffer is
divided into two equal halves so that NI-DAQ can save data from one half while filling the
other half. This mechanism makes it necessary to alternately save both halves of the buffer
so that NI-DAQ does not overwrite data in the buffer before saving the data. Use the
divided into two equal halves so that NI-DAQ can save data from one half while filling the
other half. This mechanism makes it necessary to alternately save both halves of the buffer
so that NI-DAQ does not overwrite data in the buffer before saving the data. Use the
DAQ_DB_Transfer
functions to save the data as NI-DAQ acquires it. For additional
information, see Chapter 5, NI-DAQ Double Buffering, of the NI-DAQ User Manual for PC
Compatibles, for more information.
Compatibles, for more information.
Name
Type
Description
deviceNumber
i16
assigned by configuration utility
DBmode
i16
enable or disable double-buffered mode