Chapter 4
Connecting the Signals
©
National Instruments Corporation
4-5
PFI3/GPCTR1_SOURCE
DGND
Input
Output
PFI3/Counter 1 Source—As an input, this is a PFI.
As an output, this is the GPCTR1_SOURCE signal.
This signal reflects the actual source connected to the
general-purpose counter 1.
PFI4/GPCTR1_GATE
DGND
Input
Output
PFI4/Counter 1 Gate—As an input, this is a PFI.
As an output, this is the GPCTR1_GATE signal. This signal
reflects the actual gate signal connected to the
general-purpose counter 1.
GPCTR1_OUT
DGND
Output
Counter 1 Output—This output is from the general-purpose
counter 1 output.
PFI5/UPDATE*
DGND
Input
Output
PFI5/Update—As an input, this is a PFI.
As an output, this is the UPDATE* signal. A high-to-low edge
on UPDATE* indicates that the AO primary group is being
updated.
PFI6/WFTRIG
DGND
Input
Output
PFI6/Waveform Trigger—As an input, this is a PFI.
As an output, this is the WFTRIG signal. In timed
AO 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 a PFI.
As an output, this is the STARTSCAN signal. This pin pulses
once at the start of each AI 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 a PFI.
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 a PFI.
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.
Table 4-2.
I/O Connector Signal Descriptions (Continued)
Signal Name
Reference
Direction
Description