Chapter 3
Connecting the Signals
©
National Instruments Corporation
3-25
DAQPad-MIO-16XE-50 User Manual
In edge-detection mode, the minimum pulse width required is 10 ns. This
applies for both rising-edge and falling-edge polarity settings. There is no
maximum pulsewidth requirement in edge-detection mode.
In level-detection mode, there are no minimum or maximum pulsewidth
requirements imposed by the PFIs themselves, but there may be limits
imposed by the particular timing signal being controlled. These
requirements are listed later in this chapter.
DAQ Timing Connections
The DAQ timing signals are TRIG1, TRIG2, STARTSCAN, CONVERT*,
AIGATE, SISOURCE, SCANCLK, and EXTSTROBE*.
Posttriggered DAQ allows you to view only data that is acquired after a
trigger event is received. A typical posttriggered DAQ sequence is shown
in Figure 3-12. Pretriggered DAQ allows you to view data that is acquired
before the trigger of interest in addition to a fixed number of data points
acquired after the trigger. Figure 3-13 shows a typical pretriggered DAQ
sequence. The description for each signal shown in these figures is included
later in this chapter.
Figure 3-12.
Typical Posttriggered Acquisition
1
3
0
4
2
TRIG1
STARTSCAN
CONVERT*
Scan Counter
