5-20 | ni.com
Chapter 5 Counters
Figure 5-20. Channel Z Reload with X4 Decoding
Measurements Using Two Pulse Encoders
The counter supports two pulse encoders that have two channels—channels A and B.
The counter increments on each rising edge of channel A. The counter decrements on each rising
edge of channel B, as shown in Figure 5-21.
Figure 5-21. Measurements Using Two Pulse Encoders
For information about connecting counter signals, refer to the Default Counter/Timer Routing
section.
Buffered (Sample Clock) Position Measurement
With buffered position measurement (position measurement using a sample clock), the counter
increments based on the encoding used after the counter is armed. The value of the counter is
sampled on each active edge of a sample clock. The STC3 transfers the sampled values to host
memory using a high-speed data stream. The count values returned are the cumulative counts
since the counter armed event; that is, the sample clock does not reset the counter. You can route
the counter sample clock to the Gate input of the counter. You can configure the counter to
sample on the rising or falling edge of the sample clock.
Ch A
Ch B
Counter Value
5
6
A = 0
B = 0
Z = 1
Ch Z
Max Timebase
8
9
021743
Ch A
Ch B
Counter Value
2 3 54 344
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