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Supervisory and Command/control request some tips

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HeLLo, im doing a small project in which i have to control and see some relays in real time wirelessly.

I am working with a STM32F4 "Micro-controller" and 2*Xbee S1 for the communication,one on computer,one linked with the STM32F4.

I can Read easily with Visa the data sent,i face some difficulties in Labview programmation:

-I want to use Global variables that refreshes in each event "change of position of relay for example"  And re-use them in Sub Vis or other VIs in same project.

-My Idea : - I create a vi called "Real-time variable" which let me see all created variables and their states.
                    -And i use them in another VIs in same project. 
                      Is it possible? if yes,i need some tips cause im blocked now i dont know how to proceed

 

-The part of building application with run time installer i did it well without VISA.


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