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Hardware Arm Start Triggers
Counter Pairs
Note
Ctr <4..7> are not available on the NI 6601.
Counter Applications
© National Instruments Corporation
You can arm each counter using a software command or by using the
Arm Start Trigger. The Arm Start Trigger may be an internal or an external
signal. By using the Arm Start Trigger, you can start more than one counter
simultaneously by configuring each counter to use the same Arm Start
Trigger signal.
Each counter on the TIO is paired with another counter. This pairing allows
some counter signals to connect to signals on the other counter.
The counters are paired as shown in Table 3-8.
ctr0
ctr2
ctr4
ctr6
Ctr0InternalOutput, which you can connect to Ctr1Gate, is an example of
two signals that you can connect between the ctr0/ctr1 pair. Conversely, to
connect Ctr0InternalOutput to Ctr2Gate, you must use other circuitry on
the TIO device (such as RTSI Triggers).
You can use the TIO device in the following counter-based applications.
•
Counting Edges
•
Frequency Measurement
•
Period Measurement
•
Position Measurement with Linear and Angular Encoders
•
Pulse Width Measurement
•
Semi-Period Measurement
•
Two-Edge Separation Measurement
•
Pulse Generation
Table 3-8. Counter Pairs
ctr1
ctr3
ctr5
ctr7
3-15
Chapter 3
Signal Connections
NI 660x User Manual
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