This is a Molex Picoblade cable used to connect a Black Magic Probe to a Lisa/S or Lisa/M(X) autopilot.
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:
GND
RX
TX
+5V
The Lisa/S Serial Interface Adapter as well as the Lisa/...