Pioneer SCSI-2 - Manual (Page 32)

Change Definition
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2.3 Change Definition (40h)
When executed, the CHANGE DEFINITION command modifies the operating definition of the
drive regardless of the specified logical unit number.
A SCSI reset or BUS DEVICE RESET will not affect the definition changed by the CHANGE
DEFINITION command.
Cycling the power to the drive OFF and ON will cause the operating definition to revert to the
default setting.
If the CHANGE DEFINITION command did not execute successfully, the operating definition
will remain in the same status it was prior to the attempted execution of the CHANGE
DEFINITION command.
Operation Code is (40h).
Save Control Bit (SCB)
Must be set to “0” (FALSE).
The drive will not save the operating definition. A power reset will set the drive to its initial
operating definition.
Definition Parameter specifies the operating definition. The Definition Parameter field supports
the following field values:
00h : Use current operating definition
01h : SCSI-1 operating definition
02h : SCSI-1 operating definition
03h : SCSI-2 operating definition
04h~7Fh : Reserved
DRIVE NOTES:
This command is used by the DRM-604X.
Drives that are SCSI-2 only and will reject the CHANGE DEFINITION command are:
DRM-602X, DRM-624X, DRM-1804X and the DR-U Series drives