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RT PC code example

System controller application example: Home Security System

Example of a complete RT system controller based on the Queued Message Handler (QMH) design pattern with multiple parallel task loops implementing behaviors with queued state machines (QSMs), various inter-process communication techniques (queues and local variables), and inter-target communication techniques (network-published shared variables (NPSVs) and network streams). The PC host human-machine interface (HMI) can remotely connect to the system through the network, monitor the status of the security system, and control it remotely.

LabVIEW front panels of the "Home Security System" application: RT target with virtual user interface and PC host remote interface

Use cases


Keep in mind

Example code

Expected results

https://youtu.be/vgS2MgBEmXE (3:35)

Developer walk-through

https://youtu.be/s_KqgVgEj8g (14:20)


For more information

  1. Effective LabVIEW Programming (http://www.ntspress.com/publications/effective-labview-programming/)
    An excellent textbook by Dr. Thomas J. Bress covering all aspects of system design; Chapter 27 describes the "Event-driven Producer-Consumer State Machine" in detail. Download all of the code examples from this textbook: follow the link above, select "User Resources", and then "All VIs".
  2. The LabVIEW Style Book (https://www.pearson.com/us/higher-education/program/Blume-Lab-VIEW-Style-Book-The/PGM219404.html)
    A comprehensive textbook by Peter A. Blume that lays out everything you need to know about best practices for LabVIEW system design.