National Instruments NI 6601 User Manual

Chapter 3 Signal Connections
© National Instruments Corporation 3-15 NI 660x User Manual
Hardware Arm Start Triggers
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.
Counter Pairs
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.
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).
Note Ctr <4..7> are not available on the NI 6601.
Counter Applications
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
ctr0 ctr1
ctr2 ctr3
ctr4 ctr5
ctr6 ctr7

National Instruments NI 6601 Specifications

General

Brand	National Instruments
Model	NI 6601
Category	PCI Card
Language	English