Button Select (Dvd); Enter Button (Dvd) - Pioneer DVD-V7400 Command Protocol Manual

If the disc that is being played does not have the button in that screen when
the command is issued, an error message (E06) is returned.
* If the command is available, "R<CR>" displays on the screen immediately.
However, this does not confirm that the command is executed completely.
Execution :
String
3NB<CR>
6.37

Button Select (DVD)

Function : Selects the button (arrow key emulation)
Format : Integer CU
Explanation :
The command emulates the "arrow" key on the remote control while the
button exists on the screen. The command specifies the direction using four
numbers:
If the command is valid for the situation, the player immediately returns
"R<CR>"*.
If there are no buttons on the screen when the command is issued, an error
message (E04) is returned.
*: If the command is available, "R<CR>" appears on the screen immediately.
However, this does not confirm that the command is executed completely.
Execution :
String
2CU<CR>
6.38

Enter Button (DVD)

Function : sets the button and executes
Format : Integer ET
Status Return DVD player
Shows the disc menu
R<CR> Selects and executes the button #3
The command selects the menu button displayed on the screen.
Integer directions
1
2
3
4
Status Return
R<CR>
- 75
Current Address Request Descriptions
Up
Down
Left
Right
DVD player
Shows the disc menu
Moves the cursor down
to the next button