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Chapter 4 Signal Connections
6023E/6024E/6025E User Manual 4-6 ni.com
PFI5/UPDATE* DGND Input
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 6024E or
6025E.
PFI6/WFTRIG DGND Input
Output
PFI6/Waveform Trigger—as an input, this is one of the
PFIs.
Asanoutput, thisisthe WFTRIG(AOStart Trigger)signal.
In timed analog output sequences, a low-to-high transition
indicates the initiation of the waveform generation.
PFI7/STARTSCAN DGND Input
Output
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 atthe start ofeach analog input
scan in the interval scan. A low-to-high transition indicates
the start of the scan.
PFI8/GPCTR0_SOURCE DGND Input
Output
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/GPCTR0_GATE DGND Input
Output
PFI9/Counter 0 Gate—as an input, this is one of the PFIs.
Asanoutput, thisis theGPCTR0_GATEsignal.Thissignal
reflects the actual gate signal connected to the
general-purpose counter 0.
GPCTR0_OUT DGND Output Counter 0 Output—this output is from the general-purpose
counter 0 output.
FREQ_OUT DGND Output Frequency Output—this output is from the frequency
generator output.
*
Indicates that the signal is active low
1
Not available on the 6023E
2
Not available on the 6023E or 6024E
Table 4-2. I/O Connector Signal Descriptions (Continued)
Signal Name Reference Direction Description