National Instruments DAQ PCI E Series User Manual page 48

Signal Name
DIO<0..7>
+5 V
SCANCLK
EXTSTROBE*
PFI0/TRIG1
PFI1/TRIG2
PFI2/CONVERT*
PFI3/GPCTR1_SOURCE
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Reference Direction
DGND Input or
Output
DGND Output
DGND Output
DGND Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
Description
Digital I/O signals—DIO6 and 7 can control the up/down
signal of general-purpose counters 0 and 1, respectively.
+5 VDC Source—These pins are fused for up to 1 A of
+5 V supply. The fuse is self-resetting.
Scan Clock—This pin pulses once for each A/D conversion
in the scanning modes 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 either one of the
Programmable Function Inputs (PFIs) or the source for the
hardware analog trigger. PFI signals are explained in the
Timing Connections section later in this chapter. The
hardware analog trigger is explained in the Analog Trigger
section in Chapter 2, Installation and Configuration.
Analog trigger is available only on the PCI-MIO-16E-1,
PCI-MIO-16E-4, PCI-MIO-16XE-10, PCI-6031E,
PCI-6032E, PCI-6033E, and the PCI-6071E.
As an output, this is the TRIG1 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 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* 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.
4-5
Chapter 4 Signal Connections
PCI E Series User Manual