The sequence I use for my Sony DVP-CX985V changers is ...

Stop
Display
Enter
Numberical Entry (Slot Number)
Enter
Display

The stop action at the beginning of this sequence is to ensure that a disc is not currently playing. This in turn ensures that only one display command is needed to clear the screen at the end of the sequence. If a disc is already playing in the 985 when entering the display menu there are actually two display menus available, hence two display commands would be needed to clear the screen.