National Instruments DAQ PCI-6023E User Manual page 34

Signal Name
SCANCLK
EXTSTROBE*
PFI0/TRIG1
PFI1/TRIG2
PFI2/CONVERT*
PFI3/GPCTR1_SOURCE
PFI4/GPCTR1_GATE
GPCTR1_OUT
© National Instruments Corporation
Table 4-1. I/O Connector Signal Descriptions (Continued)
Reference Direction
DGND Output
DGND Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Output
Scan Clock—This pin pulses once for each A/D conversion
in scanning mode when enabled. The low-to-high edge
indicates when the input signal can be removed from the
input or switched to another signal.
External Strobe—This output can be toggled under software
control to latch signals or trigger events on external devices.
PFI0/Trigger 1—As an input, this is one of the
Programmable Function Inputs (PFIs). PFI signals are
explained in the Timing Connections
chapter.
As an output, this is the TRIG1 (AI Start Trigger) signal. In
posttrigger data acquisition sequences, a low-to-high
transition indicates the initiation of the acquisition
sequence. In pretrigger applications, a low-to-high
transition indicates the initiation of the pretrigger
conversions.
PFI1/Trigger 2—As an input, this is one of the PFIs.
As an output, this is the TRIG2 (AI Stop Trigger) 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 one of the PFIs.
As an output, this is the CONVERT* (AI 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 one of the PFIs.
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 one of the PFIs.
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.
4-5
Chapter 4 Signal Connections
Description
section later in this
PCI-6023E/6024E/6025E User Manual