National Instruments NI PCI-6110 - Manual (Page 49)

Chapter 4 Connecting Signals
© National Instruments Corporation 4-19 NI PCI-6110/6111 User Manual
Figure 4-10. Typical Pretriggered Acquisition
TRIG1 Signal
Any PFI pin can receive as an input the TRIG1 signal, which is available
as an output on the PFI0/TRIG1 pin.
Refer to Figures 4-9 and 4-10 for the relationship of TRIG1 to the
DAQ sequence.
As an input, the TRIG1 signal is configured in the edge-detection mode.
You can select any PFI pin as the source for TRIG1 and configure the
polarity selection for either rising or falling edge. The selected edge of the
TRIG1 starts the DAQ sequence for both posttriggered and pretriggered
acquisitions. The NI PCI-6110/6111 supports analog triggering on the
PFI0/TRIG1 pin. Refer to Chapter 3,
Hardware Overview , for more
information on analog triggering.
As an output, TRIG1 reflects the action that initiates a DAQ sequence even
if another PFI is externally triggering the acquisition. The output is an
active high pulse with a pulse width of 25 to 50 ns. This output is set to
high-impedance at startup.
n/a
0 1 2 3 1 0 2 2 2
TRIG1
TRIG2
STARTSCAN
CONVERT*
Scan Counter