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Cottonwood UHF RFID Reader

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I have some inquires about the Cottonwood UHF RFID Reader

I am working with their demo software "UHF RFID Reader Demo "

Linked below: 


I am following the exact same steps as in the following tutorial: 


However when I try to add a serial reader, I get a " Fail to open the COM Port"

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I tried the code linked in the previous post with two different Arduino versions 1.0.5 and 1.6.4 on a mac book, 

but still nothing is displayed at the serial monitor. 


Also, when I tried the code on Arduino software installed at windows, I still did not get any results. 

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