NI 6221 (37-Pin)

Default NI-DAQmx Counter Terminals (Connector 0)

 Terminal  Signal
13 CTR 0 SRC
32 CTR 0 GATE  
33 CTR 0 AUX
17 CTR 0 OUT
15 CTR 1 SRC
34 CTR 1 GATE
35 CTR 1 AUX
36 CTR 1 OUT
Note  For more information about default NI-DAQmx counter inputs, refer to the NI-DAQmx Help.