68-Pin M Series Signal Connections for Counters
The following table lists the default input terminals for various counter measurements on M Series devices, including M Series USB devices, such as the NI USB 6259 screw terminal and NI USB-6229 BNC devices. 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 8 Count Direction: PFI 10 |
Edges: PFI 3 Count Direction: PFI 11 |
| Pulse Width Measurement | PFI 9 | PFI 4 |
| Period/Frequency Measurement (Low Frequency with One Counter) | PFI 9 | PFI 4 |
| Period/Frequency Measurement (High Frequency with Two Counters) | PFI 8 | PFI 3 |
| Period/Frequency Measurement (Large Range with Two Counters) | PFI 8 | PFI 3 |
| Semiperiod Measurement | PFI 9 | PFI 4 |
| Two-Edge Separation Measurement | Start: PFI 10 Stop: PFI 9 |
Start: PFI 11 Stop: PFI 4 |
| Position Measurement | A: PFI 8 B: PFI 10 Z: PFI 9 |
A: PFI 3 B: PFI 11 Z: 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 12 | PFI 13 |
 |
Note Some M Series devices, including the NI 6010, NI 6154, NI 6221 (37-pin), and NI 623X, use the 37-pin DSUB connector. These devices have different counter terminal defaults. Refer to the 37-Pin DSUB Signal Connections for Counters for the default input terminals on these devices. Bus-powered M Series devices, such as the NI USB-621X devices, also have different counter terminal defaults. Refer to the Bus-Powered M Series Signal Connections for Counters for the default input terminals on these devices. |