National Instruments NI 6115/6120 User Manual page 41

Chapter 4 Connecting Signals
Table 4-2. Signal Descriptions for I/O Connector Pins (Continued)
Signal Name
PFI0/TRIG1
PFI1/TRIG2
PFI2/CONVERT*
PFI3/GPCTR1_SOURCE
PFI4/GPCTR1_GATE
GPCTR1_OUT
PFI5/UPDATE*
PFI6/WFTRIG
PFI7/STARTSCAN
NI 6115/6120 User Manual
Reference Direction
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
4-4
Description
PFI0/Trigger 1—As an input, this is either a PFI or the
source for the hardware analog trigger. PFI signals are
explained in the Connecting Timing Signals
later in this chapter. The hardware analog trigger is
explained in the Analog Trigger
Hardware Overview. As an output, this is the TRIG1
signal. In posttrigger DAQ sequences, a low-to-high
transition indicates the initiation of the DAQ sequence.
In pretrigger applications, a low-to-high transition
indicates the initiation of the pretrigger conversions.
PFI1/Trigger 2—As an input, this is a PFI. As an
output, this is the TRIG2 signal. In pretrigger
applications, a low-to-high transition indicates the
initiation of the posttrigger conversions. TRIG2 is not
used in posttrigger applications.
PFI2/Convert—As an input, this is a PFI. As an output,
this is the CONVERT* signal. A high-to-low edge on
CONVERT* indicates that an A/D conversion is
occurring.
PFI3/Counter 1 Source—As an input, this is a PFI. As
an output, this is the GPCTR1_SOURCE signal. This
signal reflects the actual source connected to the
general-purpose counter 1.
PFI4/Counter 1 Gate—As an input, this is a PFI. As an
output, this is the GPCTR1_GATE signal. This signal
reflects the actual gate signal connected to the
general-purpose counter 1.
Counter 1 Output—This output is from the
general-purpose counter 1 output.
PFI5/Update—As an input, this is a PFI. As an output,
this is the UPDATE* signal. A high-to-low edge on
UPDATE* indicates that the AO primary group is being
updated.
PFI6/Waveform Trigger—As an input, this is a PFI.
As an output, this is the WFTRIG signal. In timed
AO sequences, a low-to-high transition indicates the
initiation of the waveform generation.
PFI7/Start of Scan—As an input, this is a PFI. As an
output, this is the STARTSCAN signal. This pin pulses
once at the start of each AI scan in the interval scan.
A low-to-high transition indicates the start of the scan.
section
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