Pioneer SCSI-2 - Manual (Page 168)

Write CDP
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2.45 Write CDP (E3h)
Operation Code is (E3h).
Transfer Length is the number of bytes of CDP command data to be sent.
This command sends alphanumeric Player Control commands to the drive. The drive returns the
command status after the player control command is transferred to the drive controller chip. A
GOOD status indicates only that the command was syntactically correct. The READ CDP
command must be used to determine the results of the operation.
(See Appendices A and B for details on audio functions.)
The Player Control command data can contain up to 21 characters including a Carriage Return
(0Dh). If Transfer Length is larger than 21, Check Condition is returned with sense key
ILLEGAL REQUEST and sense code 24h, "Invalid Command Block Other Than 20 or 21".
IMPORTANT: THE COMMAND STRING MUST BE TERMINATED WITH A CARRIAGE
RETURN
Data after a Carriage Return is ignored. When there is no Carriage Return, Check Condition is
returned with sense key ILLEGAL REQUEST, sense code "Error in Parameter List" (26h).
When media change is prohibited by the PREVENT/ALLOW MEDIA REMOVAL command,
the magazine eject command "Z0" is ignored. When the command string consists of multiple
request commands (such as "?Z"), only the status of the first command is returned by the READ
CDP command.