National Instruments 3.21E+04 用户手册

Chapter 4     Signal Connections

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 National Instruments Corporation

4-7

AT-MIO/AI E Series User Manual

PFI2/CONVERT* 

DGND

Input

Output

PFI2/Convert—As an input, this is one of the PFIs.  

As an output, this is the CONVERT* signal.  A high-to-low 
edge on CONVERT* indicates that an A/D conversion is 
occurring.

PFI3/GPCTR1_SOURCE 

DGND

Input

Output

PFI3/Counter 1 Source—As an input, this is one of the 
PFIs.  

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 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.

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 one of the PFIs.  

As an output, this is the UPDATE* signal.  A high-to-low 
edge on UPDATE* indicates that the analog output primary 
group is being updated.

PFI6/WFTRIG

DGND

Input

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.

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 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.