Pioneer BDP-LX91 - Manual (Page 5)

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control wires other than TxD and RxD.
With some computers, however, hardware processing of the CTS input is required for operation.
In this case a DTR output can be used. As long as signal transfer is possible, a positive potential is
output for DTR. Connect the DTR output to the computer's CTS input.
2.3 Commands and Status
Processing differs for the remote control button commands and other commands.
When the player receives a remote control button command, it sends the "Completed" message
(R<CR>) and conducts the same operation as the remote control button.
As the basic protocol for commands other than "remote control button" commands, the computer
issues the command to the player and the player returns the status.
Examples: Computer Player
(1) "Stop playback" → (2) Playback stops.
99RJ<CR>
← (3) "Completed"
R<CR>
(4) "Open disc tray" → (5) Disc tray opens.
OP <CR>
← (6) "Completed"
R<CR>
Once execution of the command is fully completed, the player sends the "Completed" message
(R<CR>).
If an error occurs, the player sends the error code, for example "04<CR>.
The function for returning the status automatically with respect to execution of commands is called
"Auto status".
The auto status function notifies the computer of the timing for issuing the next command.
If the computer does not use this function, the next command must be issued after fully considering
the command processing time.
There is also the "Request status" function for checking the player's status, making it possible to
learn player information and such disc information as the operating mode, time, etc.
The main request status functions are as shown below.
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