LabView Exam

Sends a message to all functions waiting on the notifier

Send Notification

Why should you use sequential programming?

Sequential programming ensures the order of tasks

What are the 4 types of simple design patterns?

Simple General State Machine Event-Based State Machine

Code that involves timing a real world operation to perform within a set time period or controls the frequency at which a loop executes

Software control timing

Part of a program that satisfies a condition, performs an action or waits for an event

State

A common and useful design pattern in LabView that usually has a start up and shut down state, but also contains other states

State Machine

A technique for keeping files open while you perform multiple write operations

Streaming Data to Disk

A specific type of binary file created for National Instruments products

TDMS

Which file format is best in an application that requires high-speed streaming?

TDMS

VISA is a high-level API that calls low-level drivers

True

After opening a file, which output does the Open/Create/Replace File I/O function return?

Refnum Out

Release the Notifier

Release Notifier

Releases the Queue

Release Queue

A specific type of binary file that is standard used by most programs

ASCII

Commands the instrument to carry out an action

Action/Status

Signals that vary continuously

Analog

What is NI MAX?

A tool to configure and test the DAQ device. A tool to test instrument communication

The underlying file format of all other formats

Binary

Defines the object type

Class

Terminates the software connection to the instrument

Close

Software routines that configure the instrument to perform specific operations

Configure

A reference to a front panel object

Control Reference

Digital timing signal that includes characteristics of a digital signal that can be counted or measured.

Counter

What is the basic DAQmx application processes in order?

Create task Configure Task Start Task Acquire data Clear Task Check for errors

Transfers data to or from the instrument

Data

The process of measuring an electrical or physical phenomenon with a computer

Data acquisition

Removes data from the queue

Dequeue Element

Code implementations and techniques that are solutions to specific problems in software design.

Design Patterns

Electrical signals that transfer binary data, such as on/off or True/False

Digital

Adds data to the queue

Enqueue element

VI or code that changes normal flow or program execution when an error occurs

Error Handler

A user interface event handler with the transition ability of the state machine

Event Based State Machine

Code that uses timing functions to give the processor time to complete other tasks

Execution timing

The Property Node is part of a SubVI

Explicitly Linked

When using a Sequence structure, you can stop the execution in the middle of a sequence

False

You should use variables in your VI whenever possible.

False

A non-reentrant VI that uses uninitialized shift registers to hold global data

Functional Global Variable

The physical cable connecting the instrument

Hardware Connectivity

The property Node is linked to the front panel object

Implicitly linked

Establishes communication with the instrument and is the first instrument driver VI called.

Initialize

a tab-delimited text file you can open with a spreadsheet application or a text-editing application

LVM

Provide individual functions for each step in file I/O operations

Low-Level File I/O

Functions the suspend the execution of a block diagram until they receive data from another section of the block diagram or from another VI running in the same application instance

Notifier Function

A member of a class

Object

Creates the notifier before the loop begin and defines the data type for the notifier

Obtain Notifier

Creates the queue before the loops begin and defines the data type for the queue

Obtain Queue

`What is a Race Condition?

Occurs when the timing of events or the scheduling of tasks unintentionaly affects an output

Single valued attributes of the objects

Properties Methods

What buffers data

Queue

Identifies unique file I/O sessions

Refnum

Condition, Action, or event that causes the program to move to the next state

Transition

Performs a variety of auxiliary operations

Utility

Block diagram elements that access or store data in another location

Variable

Waits until the notifier receives a message

Wait on notification