National Instruments 321645c-01 用户手册

Chapter 2

Function Reference — Select_Signal

NI-DAQ FRM for PC Compatibles

2-374

©

 National Instruments Corporation

Table 2-35.  Possible Values for signal

Timing and 
Control 
Signals 
Used 
Internally 
by the 
Onboard 
DAQ-STC

ND_IN_START_TRIGGER

Start trigger for the 

DAQ

 and 

SCAN

 

functions 

ND_IN_STOP_TRIGGER

Stop trigger for the 

DAQ

 and 

SCAN

 

functions 

ND_IN_SCAN_CLOCK_TIMEBASE

Scan clock timebase for the 

SCAN

 

functions 

ND_IN_CHANNEL_CLOCK_TIMEBASE

Channel clock timebase for the 

DAQ

 and 

SCAN

 functions

ND_IN_CONVERT

Convert signal for the 

AI

, 

DAQ

 and 

SCAN

 functions

ND_IN_SCAN_START

Start scan signal for the 

SCAN

 

functions 

ND_IN_EXTERNAL_GATE

External gate signal for the 

DAQ

 

and 

SCAN

 functions

ND_OUT_START_TRIGGER

Start trigger for the 

WFM

 functions

ND_OUT_UPDATE

Update signal for the 

AO

 and 

WFM

 

functions

ND_OUT_UPDATE_CLOCK_TIMEBASE

Update clock timebase for the 

WFM

 

functions

ND_PLL_REF_SOURCE

Phase-locked loop (PLL) 
reference clock source for 

WFM

 

functions

ND_OUT_EXTERNAL_GATE

External gate signal for the 

WFM

 

functions

I/O 
Connector 
Pins

ND_PFI_0 through PFI_9 

Signal present at the I/O connector 
pin PFI0 through PFI9.

ND_GPCTR0_OUTPUT

Signal present at the I/O connector 
pin 

GPCTR0_OUTPUT

ND_GPCTR1_OUTPUT

Signal present at the I/O connector 
pin 

GPCTR1_OUTPUT

ND_FREQ_OUT

Signal present at the 

FREQ_OUT

 

output pin on the I/O connector