Chapter 4 Signal Connections
DAQCard E Series User Manual
4-4
National Instruments Corporation
PFI1/TRIG2
DGND
Input
Output
PFI1/Trigger 2—As an input, this is one of the PFIs.
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*
DGND
Input
Output
PFI2/Convert—As an input, this is one of the PFIs.
As an output, this is the CONVERT* signal. A high-to-low
edge on CONVERT* indicates that an A/D conversion is
occurring.
PFI3/GPCTR1_SOURCE
DGND
Input
Output
PFI3/Counter 1 Source—As an input, this is one of the
PFIs.
As an output, this is the GPCTR1_SOURCE signal. This
signal reflects the actual source connected to general-
purpose counter 1.
PFI4/GPCTR1_GATE
DGND
Input
Output
PFI4/Counter 1 Gate—As an input, this is one of the PFIs.
As an output, this is the GPCTR1_GATE signal. This signal
reflects the actual gate signal connected to general-purpose
counter 1.
GPCTR1_OUT
DGND
Output
Counter 1 Output—This output is from the general-purpose
counter 1 output.
PFI5/UPDATE*
DGND
Input
Output
PFI5/Update—As an input, this is one of the PFIs.
As an output, this is the UPDATE* signal. A high-to-low
edge on UPDATE* indicates that the analog output primary
group is being updated.
PFI6/WFTRIG
DGND
Input
Output
PFI6/Waveform Trigger—As an input, this is one of the
PFIs.
As an output, this is the WFTRIG signal. In timed analog
output sequences, a low-to-high transition indicates the
initiation of the waveform generation.
Table 4-1.
I/O Connector Signal Descriptions (Continued)
Signal Name
Reference
Direction
Description
