Chapter4 ConnectingSignals
NI6013/6014 User Man ual 4-24 ni.com
ignoresTRIG2 if it is asserted prior to the SC decrementing to zero. After
theselected edge of TRIG2 is received, the device acquires a fixed number
ofscans and the acquisition stops. This mode acquires data both beforeand
afterreceiving TRIG2.
As anoutput, TRIG2 reflects the posttrigger in a pretriggered DAQ
sequence, evenif the acquisition is being externally triggered by another
PFI.TRIG2 i sno t used in posttriggered data acquisition. The output is an
activehigh pulse with a pulse width of 50 to 100 ns. This outp ut is sett o
high-impedance at startup.
Figures 4-15 and 4-16 showthe input and outp ut timing requirements
for TRIG2.
Figure4-15. TRIG2 Input Signal Timing
Figure4-16. TRIG2 Output Signal Timing
Rising-Edge
Polarity
Falling-Edge
Polarity
tw=10 ns minimum
tw
tw=50to100ns
tw