Chapter 4
Signal Connections
PCI-6023E/6024E/6025E User Manual
4-6
©
National Instruments Corporation
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 PCI-6024 or
PCI-6025.
PFI6/WFTRIG
DGND
Input
Output
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/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 at the start of each 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.
As an output, this is the GPCTR0_GATE signal. This signal
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 PCI-6023E
2
Not available on the PCI-6023E or PCI-6024E
Table 4-1. I/O Connector Signal Descriptions (Continued)
Signal Name
Reference
Direction
Description
PCI.book Page 6 Wednesday, September 16, 1998 9:09 AM
