National Instruments PCI-445 Series User Manual page 45

Chapter 4 Signal Connections
Signal Name
PFI4/GPCTR1_GATE
UPDATE*
GPCTR1_OUT
PFI6/WFTRIG
PFI7
PFI8/GPCTR0_SOURCE
PFI9/GPCTR0_GATE
GPCTR0_OUT
FREQ_OUT
PCI-4451/4452/4453/4454 User Manual
Table 4-5. Digital I/O Connector Pin Assignment (Continued)
Reference Direction
DGND Input
Output
DGND Output
DGND Output
DGND Input
Output
DGND Input
DGND Input
Output
DGND Input
Output
DGND Output
DGND 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 the
general-purpose counter 1.
A high-to-low edge on UPDATE* indicates that a D/A
conversion is occurring.
In LabVIEW, referred to as AO Update.
General-Purpose Counter 1 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.
In LabVIEW, referred to as AO Start Trigger for both input
and output.
PFI7—This is one of the PFIs.
PFI8/Counter 0 Source—As an input, this is one of the
PFIs.
As an output, this is the GPCTR0_SOURCE signal. This
signal reflects the actual source connected to the
general-purpose counter 0.
PFI9/Counter 0 Gate—As an input, this is one of the PFIs.
As an output, this is the GPCTR0_GATE signal. This signal
reflects the actual GATE signal connected to the
general-purpose counter 0.
General-Purpose Counter 0 Output
Frequency Output—This output is from the frequency
generator output.
4-10
Description
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