National Instruments 3.21E+04 用户手册

Appendix C     Common Questions

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 National Instruments Corporation

C-5

AT-MIO/AI E Series User Manual

b.

Set up data acquisition timing so that the timing signal for 
A/D conversion comes from PFI5, as follows:

•

If you are using NI-DAQ, call 

Select_Signal(deviceNumber, 

ND_IN_CONVERT, ND_PFI_5, ND_HIGH_TO_LOW)

.

•

If you are using LabVIEW, invoke AI Clock Config VI with 

clock source code set to PFI pin, high to low, and clock source 
string set to 5.

c.

Initiate analog input data acquisition, which will start only 
when the analog output waveform generation starts.

•

If you are using NI-DAQ, call 

DAQ_Start

 with appropriate 

parameters.

•

If you are using LabVIEW, invoke AI Control VI with control 

code set to 0 (start).

d.

Initiate analog output waveform generation.

•

If you are using NI-DAQ, call 

WFM_Group_Control

 with 

operation set to 1 (start).

•

If you are using LabVIEW, invoke AO Control VI with control 

code set to 0 (start).

Digital triggering is supported by hardware on every AT E Series 
MIO board.  In addition, the AT-MIO-16E-1, AT-MIO-16E-2, 
AT-MIO-64E-3, AT-MIO-16XE-10, and AT-AI-16XE-10 support 
analog triggering in hardware. 

The DAQ-STC incorporates much more than just 10 Am9513-style 
counters within one chip.  In fact, the DAQ-STC has the 
complexity of more than 24 chips.  The DAQ-STC makes possible 
PFI lines, analog triggering, selectable logic level, and frequency 
shift keying.  The DAQ-STC also makes buffered operations 
possible, such as direct up/down control, single or pulse train 
generation, equivalent time sampling, buffered period, and 
buffered semiperiod measurement.