National Instruments NI USB-621x Counter Timing Signals

Chapter 9 Counters

frequency of the system. Figure 9-28shows an example of pulse generation for ETS; the delay from the trigger to the pulse increases after each subsequent Gate active edge.

GATE

OUT

D1 D2 = D1 + D D3 = D1 + 2 D

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).

© National Instruments Corporation 9-25 NI USB-621x User Manual