Chapter 4
Signal Connections
PCI-MIO E Series User Manual
4-30
©
National Instruments Corporation
As an output, the TRIG1 signal reflects the action that initiates a DAQ
sequence. This is true even if the acquisition is being externally
triggered by another PFI. The output is an active high pulse with a pulse
width of 50 to 100 ns. This output is set to tri-state at startup.
show the input and output timing requirements
for the TRIG1 signal.
Figure 4-15. TRIG1 Input Signal Timing
Figure 4-16. TRIG1 Output Signal Timing
The board also uses the TRIG1 signal to initiate pretriggered DAQ
operations. In most pretriggered applications, the TRIG1 signal is
generated by a software trigger. Refer to the TRIG2 signal description
for a complete description of the use of TRIG1 and TRIG2 in a
pretriggered DAQ operation.
Rising-edge
polarity
Falling-edge
polarity
tw
tw = 10 ns minimum
t w
t w = 50-100 ns