The following table lists the default input terminals for various counter measurements for devices that use the 37-Pin DSUB connector such as the NI 6010, NI 6154, and NI 623x. You can use a different PFI line for any of the input terminals. To change the PFI input for a measurement, use the NI-DAQmx channel attributes/properties.

Measurement Ctr0 Ctr1
Count Edges
  • Edges: PFI 0
  • Count Direction: PFI 2
  • Edges: PFI 3
  • Count Direction: PFI 5
Pulse Width Measurement PFI 1 PFI 4
Period/Frequency Measurement (Low Frequency with One Counter) PFI 1 PFI 4
Period/Frequency Measurement (High Frequency with Two Counters) PFI 0 PFI 3
Period/Frequency Measurement (Large Range with Two Counters) PFI 0 PFI 3
Semiperiod Measurement PFI 1 PFI 4
Two-Edge Separation Measurement
  • Start: PFI 2
  • Stop: PFI 1
  • Start: PFI 5
  • Stop: PFI 4

The following table lists the output terminals for counter output. You can use a different PFI line for any of the output terminals.

Ctr0 Ctr1
PFI 6 PFI 7