C Series Signal Connections for Counters
The following table lists the default input terminals for various counter measurements. 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.
NI 9401, NI 9421, NI 9422, and NI 9423
| Measurement | Ctr0 | Ctr1 |
|---|---|---|
| Count Edges | Edges: PFI 0
Count Direction: PFI 2 |
Edges: PFI 4
Count Direction: PFI 6 |
| Pulse Width Measurement | PFI 1 | PFI 5 |
| Period/Frequency Measurement (Low Frequency with One Counter) | PFI 1 | PFI 5 |
| Period/Frequency Measurement (High Frequency with Two Counters) | PFI 0 | PFI 4 |
| Period/Frequency Measurement (Large Range with Two Counters) | PFI 0 | PFI 4 |
| Semiperiod Measurement | PFI 1 | PFI 5 |
| Two-Edge Separation Measurement | Start: PFI 2
Stop: PFI 1 |
Start: PFI 6
Stop: PFI 5 |
| Position Measurement | A: PFI 0
B: PFI 2 Z: PFI 1 |
A: PFI 4
B: PFI 6 Z: PFI 5 |
NI 9402
| Measurement | Ctr0 | Ctr1 |
|---|---|---|
| Count Edges | Edges: PFI 0
Count Direction: PFI 2 |
Edges: PFI 3
Count Direction: PFI 1 |
| Pulse Width Measurement | PFI 1 | PFI 2 |
| Period/Frequency Measurement (Low Frequency with One Counter) | PFI 1 | PFI 2 |
| 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 2 |
| Two-Edge Separation Measurement | Start: PFI 2
Stop: PFI 1 |
Start: PFI 1
Stop: PFI 2 |
| Position Measurement | A: PFI 0
B: PFI 2 Z: PFI 1 |
A: PFI 3
B: PFI 1 Z: PFI 2 |
NI 9411
| 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 |
| Position Measurement | A: PFI 0 B: PFI 2 Z: PFI 1 | A: PFI 3 B: PFI 5 Z: PFI 4 |
The following tables list the output terminals for counter output. You can use a different PFI line for any of the output terminals.
NI 9401, NI 9472, NI 9474, and NI 9485
| Ctr0 | Ctr1 |
|---|---|
| PFI 3 | PFI 7 |
NI 9481 and NI 9402
| Ctr0 | Ctr1 |
|---|---|
| PFI 0 | PFI 3 |