National Instruments DAQ PCI-6023E User Manual page 35

Chapter 4 Signal Connections
Signal Name
PFI5/UPDATE*
PFI6/WFTRIG
PFI7/STARTSCAN
PFI8/GPCTR0_SOURCE
PFI9/GPCTR0_GATE
GPCTR0_OUT
FREQ_OUT
*
Indicates that the signal is active low
1
Not available on the PCI-6023E
2
Not available on the PCI-6023E or PCI-6024E
PCI-6023E/6024E/6025E User Manual
Table 4-1. I/O Connector Signal Descriptions (Continued)
Reference Direction
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Input
Output
DGND Output
DGND Output
PFI5/Update—As an input, this is one of the PFIs.
As an output, this is the UPDATE* (AO Update) signal. A
high-to-low edge on UPDATE* indicates that the analog
output primary group is being updated for the PCI-6024 or
PCI-6025.
PFI6/Waveform Trigger—As an input, this is one of the
PFIs.
As an output, this is the WFTRIG (AO Start Trigger) signal.
In timed analog output sequences, a low-to-high transition
indicates the initiation of the waveform generation.
PFI7/Start of Scan—As an input, this is one of the PFIs.
As an output, this is the STARTSCAN (AI Scan Start)
signal. This pin pulses once at the start of each analog input
scan in the interval scan. A low-to-high transition indicates
the start of the scan.
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.
Counter 0 Output—This output is from the general-purpose
counter 0 output.
Frequency Output—This output is from the frequency
generator output.
4-6
Description
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