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Agree with Bill, that you simply short the pin to ground to assert.
That said, inside the mount, the unconnected pins should float at 3.3V or 5V depending on the CPU supply voltage.
This can be done using very weak internal or external "pullup" resistors )
As such, testing the voltage of the pins when the mount is powered is another test to show if the ports are all working. If one isnt working, a plug with built in pullups might work, but you would need to know why the proper ones werent working.
Andrew
Andrew
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