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

Using Your 653X

See the glossary for definitions to digital I/O terms used throughout this chapter.
Tip

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 653X and the peripheral device.
I want to configure the direction of each bit individually instead of groups of eight.
I want to connect two or more output drivers/pins to the same line.
I need to communicate with an external device using an exchange of signals to request and
acknowledge each data transfer.
I want to start and/or stop acquiring data upon a trigger and/or to transfer data at timed intervals.
I want the 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 653X device, navigate this chapter in the following
order:
1. Choose the correct mode of operation to perform using the table below.
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 to Use
Unstrobed I/O
Unstrobed I/O
Unstrobed output with
wired-OR driver
Handshaking I/O–
Select appropriate
protocol
Pattern I/O
Change Detection
Change Detection
653X User Manual