The following schematic shows the PlayStation 2 Diagram. Here is the description (click image to enlarge):

playstation2 cable connector pinout diagram 

  • Pin 1 for Data/Signal transfer from Controller to PSX, this signal is an 8 bit serial transmission synchronous to the falling edge of clock.
  • Pin 2, Command, is the counter part of DATA. It is again an 8 bit serial transmission on the falling edge of clock.
  • Pin 3 is unused.
  • Pin 4 for Ground.
  • Pin 5, VCC, this can vary from 5V down to 3V and the official SONY Controllers will still operate.
  • Pin 6, is used to get the attention of the controller, this signal will go low for the duration of a transmission.
  • Pin 7, Clock, is used to keep units in sync.
  • Pin 8, is not connected or N/C.
  • Pin 9, ACK, is acknowledge signal from Controller to PSX.


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