Data Translation DT9857, Руководство пользователя, Страница: 54 / 192

Chapter 3
54
Figure 24 shows how to connect counter/timer signals to the STP25 screw terminal panel to
perform an event counting operation on C/T 0 without using a gate. The counter counts the
number of rising edges that occur on the Counter 0 Clock input.
Figure 24: Connecting Counter/Timer Signals for an
Event Counting Operation Without Using a Gate
Up/Down Counting
Figure 25 shows how to connect counter/timer signals to an STP25 screw terminal panel to
perform an up/down counting operation on C/T 0. The counter keeps track of the number of
rising edges that occur on the Counter 0 Clock input. The counter increments when the
Counter 0 Gate signal is high and decrements when the Counter 0 Gate signal is low. Refer to
page 95 for more information about up/down counting operations.
Figure 25: Connecting Counter/Timer Signals for an Up/Down Counting Operation
Signal
Source
Counter 0 Clock
Digital Ground
14
16
STP25
(Connected to the DT9857 or DT9857E)
Counter 0 Clock
Digital Ground
14
12
Counter 0 Gate
16
Up/Down
Signal Source
STP25
(Connected to the DT9857 or DT9857E)