The letter designations on the camera plug are incorrect.
Ground is the left pin on the camera.
The center pin is Focus and the Right pin is Shutter.
Wiring is correct though. Dimage/Maxxum Cameras use the same plug.
The sequence of remote release is- Focus is pulled low to ground
then Shutter is pulled low to ground.
Focus must be pulled low before Shutter and held low until release.
Removal of either ground connections will end exposure.
See corrected schematic in this gallery.