National Instruments 321645c-01 用户手册

Chapter 2

Function Reference — Config_DAQ_Event_Message

NI-DAQ FRM for PC Compatibles

2-78

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using. The PC-TIO-10 can have two of these event messages configured at the same time, 
therefore you must specify which pin you want to use on the PC-TIO-10 with the 
DAQTrigVal0 parameter.

To use DAQEvent = 9, you must configure the device for interrupt-driven waveform 
generation. This DAQEvent works by using the waveform generation timing system. Thus, 
you cannot use waveform generation or single point analog output with delayed update mode 
and this DAQEvent at the same time on the same device. Also, DAQEvent = 9 is not valid 
for the E Series devices. 

trigSkipCount is the number of valid triggers NI-DAQ ignores. It can be any value greater 
than or equal to zero. For example, if trigSkipCount is 3, NI-DAQ notifies you when the 
fourth trigger occurs. 

preTrigScans is the number of scans of data NI-DAQ collects before looking for the very first 
trigger. Setting preTrigScans to 0 causes NI-DAQ to look for the first trigger as soon as the 
DAQ process begins. 

postTrigScans is the number of scans of data NI-DAQ collects after the triggers before 
notifying you. Setting postTrigScans to 0 causes event notification to happen as soon as the 
trigger occurs. 

Refer to the following table for further details on usable parameters for each DAQEvent type.

Table 2-18.  Valid Counters and External Timing Signals for DAQEvent = 9

AT-MIO-16

OUT2

low to high

AT-MIO-16D

OUT2

low to high

AT-MIO-16F-5

OUT1, OUT2, OUT5, or 
EXTDACUPDATE*

high to low

AT-MIO-16X

OUT1, OUT2, OUT5, or 
EXTTMRTRIG*

high to low

AT-MIO-64F-5

OUT1, OUT2, OUT5, or 
EXTTMRTRIG*

high to low

PC-TIO-10

EXTIRQ1 or EXTIRQ2

high to low