Chapter 7 Counters© National Instruments Corporation 7-31 M Series User ManualYou can use these defaults or select other sources and destinations for thecounter/timer signals in NI-DAQmx. Refer to Connecting Counter Signalsin the NI-DAQmx Help or the LabVIEW Help in version 8.0 or later formore information about how to connect your signals for common countermeasurements and generations. M Series default PFI lines for counterfunctions are listed in Physical Channels in the NI-DAQmx Help or theLabVIEW Help in version 8.0 or later.Counter TriggeringCounters support three different triggering actions—arm start, start, andpause.Arm Start TriggerTo begin any counter input or output function, you must first enable, or arm,the counter. Software can arm a counter or configure counters to be armedon a hardware signal. Software calls this hardware signal the Arm StartTrigger. Internally, software routes the Arm Start Trigger to the Counter nHW Arm input of the counter.For counter output operations, you can use it in addition to the start andpause triggers. For counter input operations, you can use the arm startCTR 0 B 45 (PFI 10)CTR 1 SRC 42 (PFI 3)CTR 1 GATE 41 (PFI 4)CTR 1 AUX 46 (PFI 11)CTR 1 OUT 40 (PFI 13)CTR 1 A 42 (PFI 3)CTR 1 Z 41 (PFI 4)CTR 1 B 46 (PFI 11)FREQ OUT 1 (PFI 14)Table 7-4. 68-Pin Device Default NI-DAQmx Counter/Timer Pins (Continued)Counter/Timer SignalDefault Connector 0 PinNumber (Name)
