PS2 Pad Protocol

[ThePaper]

Does anyone know the communication protocol for the PS2 gamepad?

I'm trying to access the pressure sensors on the PS2 controller however the documentation available on the web only covers the protocol for DUAL SHOCK/ANALOG PS1 controllers (ID 0x73).

I'm believe that the PS2 requests the activation of the pressure sensors on the X 0 [] /\ ... buttons with a separate command because if left to its own devices a PS2 contoller will ID itself as a DUALSHOCK/ANALOG controller and return data as if it was a PS1 controller (only provides analog data on the left right joysticks).

Hence their must be a separate command issued from the PS2 to activate the remaining analog buttons.

Is anyone able to help or point me in the right direction in accessing the PS2 controller?

Thxs.