Counter/timer signals are available to parallel digital I/O C Series modules. To determine the signal routing options for modules installed in your system, refer to the Device Routes tab 
in MAX.

You can use these defaults or select other sources and destinations for the counter/timer 
signals in NI-DAQmx. Refer to Connecting Counter Signals in the NI-DAQmx User Manual for more information about how to connect your signals for common counter measurements and generations. Refer to Physical Channels in the NI-DAQmx User Manual for a list of default PFI lines for counter functions.