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A way to see if GPIB-USB-HS is attached

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I'm controlling 18 separate GPIB power supplies with a GPIB-USB-HS cable.  These 18 power supplies are addressed as 1-18.  I want to add something to my VI that allows me to check if the GPIB-USB-HS cable is plugged in, just in case it gets accidentally knocked out.  I'm only switching the power supplies on/off every 10 minutes, but I need a way to make sure that the cable is still plugged in in the meantime.  Is there a way to do this?  I've checked the GPIB library but there's a lot of commands and none of them seemed to be what I'm looking for.  


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