Contents

Counter n A, Counter n B, and Counter n Z Signals ......................................

9-28

Routing Signals to A, B, and Z Counter Inputs................................

9-28

Counter n Up_Down Signal............................................................................

9-28

Counter n HW Arm Signal..............................................................................

9-28

Routing Signals to Counter n HW Arm Input ..................................

9-28

Counter n Internal Output and Counter n TC Signals.....................................

9-29

Routing Counter n Internal Output to an Output Terminal ..............

9-29

Frequency Output Signal ................................................................................

9-29

Routing Frequency Output to a Terminal.........................................

9-29

Default Counter/Timer Pinouts .....................................................................................

9-29

Counter Triggering ........................................................................................................

9-31

Arm Start Trigger............................................................................................

9-31

Start Trigger ....................................................................................................

9-31

Pause Trigger ..................................................................................................

9-31

Other Counter Features..................................................................................................

9-32

Sample Clock ..................................................................................................

9-32

Cascading Counters.........................................................................................

9-33

Counter Filters.................................................................................................

9-33

Prescaling ........................................................................................................

9-34

Duplicate Count Prevention ............................................................................

9-35

Example Application That Works Correctly

 

(No Duplicate Counting) ...............................................................

9-36

Example Application That Works Incorrectly

 

(Duplicate Counting) .....................................................................

9-37

Example Application That Prevents Duplicate Count......................

9-37

Enabling Duplicate Count Prevention in NI-DAQmx......................

9-38

Chapter 10

PFI

Using PFI Terminals as Timing Input Signals ..............................................................

10-2

Exporting Timing Output Signals Using PFI Terminals...............................................

10-3

Using PFI Terminals as Static Digital I/Os ...................................................................

10-3

Connecting PFI Input Signals........................................................................................

10-3

PFI Filters ......................................................................................................................

10-4

I/O Protection ................................................................................................................

10-6

Programmable Power-Up States....................................................................................

10-6