Data Translation DT9812 Series, User Manual

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Wiring Signals to the Module
39
Connecting Counter/Timer Signals
DT9812, DT9813, and DT9814 Series modules provide one counter/timer that you can use for
the following operations:
• Event counting
• Frequency measurement
• Edge-to-edge measurement
• Continuous pulse output (rate generation)
This section describes how to connect counter/timer signals for these operation modes. Refer
to
page 71 for more information about using the counter/timers.
Event Counting
Figure 12 shows how to connect counter/timer signals to the module to perform an event
counting operation using an external gate.
In this example, the counter counts the number of rising edges that occur on the Counter 0 In
signal when the Counter 0 Gate signal is in the active state (as specified by software). Refer to
page 73 for more information.
Figure 12: Connecting Counter/Timer Signals for an Event Counting Operation
Using an External Gate
Figure 13 shows how to connect counter/timer signals to the module to perform an event
counting operation without using a gate (also called a software gate). The counter counts the
number of rising edges that occur on the Counter 0 In signal.
Signal
Source
Ground
Counter 0 In
Ground
External
Gating
Switch
18
16
Counter
0 Gate
19
DT9812, DT9813, or
DT9814 Series Module