Connecting Counter/Timer Signals; Event Counting - Measurement Computing Data Translation DT9857 User Manual

Connecting Counter/Timer Signals

The DT9857 and DT9857E modules provide a general-purpose counter/timer (C/T 0) that you
can use to perform the following operations:

• Event counting

• Up/down counting
• Pulse width/period measurement
• Edge-to-edge measurement
• Continuous edge-to-edge measurement
• Pulse output (continuous, one-shot, and repetitive one-shot)
The C/T signals are available through the Digital connector on the DT9857 and DT9857E
modules. You can access these signals using the STP25 screw terminal panel, described on
page 47.
Event Counting
Figure 23 shows how to connect counter/timer signals to the STP25 screw terminal panel to
perform an event counting operation on C/T 0 using an external gate.
The counter counts the number of rising edges that occur on the Counter 0 Clock input when
the Counter 0 Gate signal is in the active state (as specified by software). Refer to
more information on event counting operations.
Signal
Source
External
Gating
Switch
Figure 23: Connecting Counter/Timer Signals for an
Event Counting Operation Using an External Gate
STP25
(Connected to the DT9857 or DT9857E)
Digital Ground
Counter 0 Clock
Counter 0 Gate
Digital Ground
Wiring Signals
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