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Chapter 2 Function Reference — DAQ_Config
NI-DAQ FRM for PC Compatibles 2-120
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National Instruments Corporation
Note (PCI-6110E and PCI-6111E only) The only allowed values for extConv are 0 and
2. The conversions occur simultaneously for all channels and are controlled by the
scan interval.
The DSA devices cannot use externally controlled clocks, so extConv is ignored.
The default settings for DAQ modes are as follows:
startTrig = 0: DAQ sequences are initiated through software.
extConv = 0: Onboard clock is used to time A/D conversions.
If you want a DAQ timing configuration different from the default setting, you must call
DAQ_Config with the configuration you want before initiating any DAQ sequences. You need
to call
DAQ_Config only when you change the DAQ configuration from the default setting.
To scan channels on an SCXI-1140 module using an external Track*/Hold signal, you should
call
DAQ_Config with extConv = 2 so that the Track*/Hold signal of the module can control
the scan interval timing during the acquisition.
The configuration information for the analog input circuitry is controlled by the
AI_Configure call. This configuration information also affects data acquisition.
You cannot use pretrigger mode in conjunction with external conversion method on
MIO-16/16D devices.