With Sony's 400-disc DVD Players you can send a pre-determined sequence of IR codes to select any given changer slot. That's possible of course, because the same can be done manually from the graphic user interface (GUI) of the changer itself. Unfortunately, Sony's 400-disc Blu-ray Players don't provide an option from the GUI (Sony XMB) to key in the slot number you want. That's why direct disc selection can only be done using RS-232 or IP control.

The Sony DVP-CX777ES 400-disc DVD Player has a serial port as well. With the 777ES you can do both. You can use a pre-determined sequence of IR codes or send the changer the particular RS-232 command instead. Thankfully Sony carried over the RS-232 functionality with the Sony BDP-CX7000ES. Sadly, neither the Sony BDP-CX960 or BDP-CX7000ES provide for direct disc selection using IR as that same functionality isn't available within the GUI (Sony XMB). Yes, it's hard to believe. I'm still shaking my head.