Digital Out Needed on same port as counter, help

[HVAC_master]

I have a PCIe-6320.  I have counters 0, 1 and 2 being used to as a counter input using the src lines.  I need a digital out to turn on a relay (3 to 5 VDC should do it).  Should I connect it to a line that is a SRC, Gate, or Aux?  Where can I read more about Src gates and aux?  Can port 3 handle a digital out?

-kevin 

[HVAC_master]

Never mind.  I had the pinout board unplugged.  

I would still appreciate if someone could point me in the right direction in learning about the differences between source, gate, and aux counters.   

[Eric_LV]

There is a fairly handy guide to using counter I/O in LabVIEW help.  The help document is called "Counter Parts in NI-DAQmx" if you search for it in help it should shed some light on how our DAQ counters work.