Question Get maximum value from a Joystick Axis with Directinput

[avreca-mortua]

Hello, I have this:

Imports Microsoft.DirectX.DirectInput
Dim JoystickDevice As Device

If JoystickDevice.CurrentJoystickState.Y < 32767 Then
            'Down
End If

it works fine in my PS3 joystick but if I turn the analog off then the medium value is 32511
and with other brand maybe the values are not the same so how can I get the maxmium value of an axis?
please help and sorry for my English