Instruction Manual

Contents
© National Instruments Corporation ix NI 6236 User Manual
Counter Timing Signals .................................................................................................7-25
Counter n Source Signal..................................................................................7-25
Routing a Signal to Counter n Source...............................................7-26
Routing Counter n Source to an Output Terminal ............................7-26
Counter n Gate Signal .....................................................................................7-27
Routing a Signal to Counter n Gate ..................................................7-27
Routing Counter n Gate to an Output Terminal................................7-27
Counter n Aux Signal ......................................................................................7-27
Routing a Signal to Counter n Aux...................................................7-27
Counter n A, Counter n B, and Counter n Z Signals.......................................7-28
Routing Signals to A, B, and Z Counter Inputs ................................7-28
Routing Counter n Z Signal to an Output Terminal..........................7-28
Counter n Up_Down Signal ............................................................................7-28
Counter n HW Arm Signal ..............................................................................7-28
Routing Signals to Counter n HW Arm Input...................................7-29
Counter n Internal Output and Counter n TC Signals .....................................7-29
Routing Counter n Internal Output to an Output Terminal...............7-29
Frequency Output Signal.................................................................................7-29
Routing Frequency Output to a Terminal .........................................7-29
Default Counter Terminals ............................................................................................7-30
Counter Triggering ........................................................................................................7-31
Arm Start Trigger ............................................................................................7-31
Start Trigger.....................................................................................................7-31
Pause Trigger...................................................................................................7-31
Other Counter Features..................................................................................................7-32
Cascading Counters .........................................................................................7-32
Counter Filters .................................................................................................7-32
Prescaling ........................................................................................................7-33
Duplicate Count Prevention ............................................................................7-34
Example Application That Works Correctly
(No Duplicate Counting)................................................................7-34
Example Application That Works Incorrectly
(Duplicate Counting)......................................................................7-35
Example Application That Prevents Duplicate Count ......................7-35
When To Use Duplicate Count Prevention.......................................7-36
Enabling Duplicate Count Prevention in NI-DAQmx ......................7-37
Synchronization Modes ...................................................................................7-37
80 MHz Source Mode .......................................................................7-38
Other Internal Source Mode..............................................................7-38
External Source Mode.......................................................................7-38