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How labview treat multiple devices handle number?

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Hi All,

 

 I am controling several SPI-to-USB adapters via Labview. Each device can be detected through serial number and then a handle is grabed, this handle (an integer number, say 0 or 1, etc) will be used for the following steps. However, it seems that sometimes different devices have the same handle number. But amazingly, as long as I keep the handle open, it will always control the corresponding device until I close the handle. I am wondering how exactly the Labview use the same handle numbers to control different devices?  Many thanks!

 

 

Kevin 


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