The Black Magic Probe provides an auxilary TTL level serial interface connector. This connector is a Molex Picoblade 4 pin header. The pinout (Left to Right) is:
The serial cable connects the Black Magic Probe to an Autopilot. As both sides of the serial cable use the power pin as an output to provide power to a peripheral, this cable is not connecting the power pins together. The appropriate sides of the wire are designated with a shrink tube label:
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