- DAQ M Series NI USB-621x User Manual

Chapter 9 Counters

frequency of the system. Figure 9-28 shows an example of pulse generation

for ETS; the delay from the trigger to the pulse increases after each

subsequent Gate active edge.

Figure 9-28. Pulse Generation for ETS

For information about connecting counter signals, refer to the Default

Counter/Timer Pinouts section.

Counter Timing Signals

USB M Series devices feature the following counter timing signals.

• Counter n Source

• Counter n Gate

• Counter n Aux

• Counter n A

• Counter n B

• Counter n Z

• Counter n Up_Down

• Counter n HW Arm

• Counter n Internal Output

• Counter n TC

•Frequency Output

In this section, n refers to either Counter 0 or 1. For example, Counter n

Source refers to two signals—Counter 0 Source (the source input to

Counter 0) and Counter 1 Source (the source input to Counter 1).

OUT

D1 D2 = D1 + ΔD D3 = D1 + 2ΔD

GATE