1. The number of the socket for the output in the female part of the connector.
Numbered in order from top left to bottom right.
2. Pin number of the plug connector.
They are numbered in order from top right to bottom left.
3. The difference between the female and plug parts of the connector. The socket and plug parts of the connector differ in the shape of their conclusions.
A) All connectors are shown from the open end with the connector lock up.
b) When disconnecting a connector, apply force directly to the connector housing, not to the wires.