New lower price for Axon II ($78) and Axon Mote ($58).
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So with GND in the center it is always connected correctly. Then if Vcc and sig are reversed this is usually ok for most devices
But this gentleman is not plugging in servos, he's plugging in vaguely specified components into vaguely specified backplanes.
unlike other pinouts, plugging in backwards does no harm
apparently they decided a 1k resistor was too much to invest in a $50 item