Using Your Ni 653X; Choosing The Correct Mode For Your Application - National Instruments 653 Series User Manual

Using Your NI 653X

Tip Refer to the glossary for definitions of DIO terms used throughout this chapter.

Choosing the Correct Mode for Your Application

I need to perform basic digital I/O that does not need hardware timing or
handshaking between the NI 653X and the peripheral device.
I want to individually configure the direction of each bit instead of in
groups of eight.
I want to connect two or more output drivers/pins to the same line.
I want to start and/or stop acquiring data upon a trigger and/or to transfer
data at timed intervals.
I need to communicate with an external device using an exchange of
signals to request and acknowledge each data transfer.
I want the NI 653X to capture input data only when certain lines change
states.
I want to monitor activity on input lines without continuously polling or
transferring unnecessary data during periods of inactivity.
© National Instruments Corporation
To begin using your NI 653X, navigate this chapter in the following order:
1. Use the table below to choose the correct mode of operation.
2. Follow the instructions for the application you want to perform.
3. Refer to pinout diagrams in Appendix C,
Accessories, when you are ready to connect your devices and/or
accessories.
Use the following table to find the correct mode for your application:
Application Requirements
2-1
2
Connecting Signals with
Suggested Mode
Unstrobed I/O
Unstrobed I/O
Unstrobed output with
open collector driver
Pattern I/O
Handshaking I/O—
Select appropriate
protocol
Change Detection
Change Detection
NI 653X User Manual