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This was an adapter for programming inteface (USB to serial YUNA100 or BLH7840) to a old camera CGO2 or older. It has no sense anymore at Q500. CGO3 does not react to the serial connection.
I use the plugs for other purposes (cut it in the middle), i.e. to connect an SR24 receiver to the Blade 350QX to control it with ST10.