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M2488 PRODUCT GUIDE TAPE UNIT SCSI COMMANDS
April 1997 CG00000-011503 REV. A 4-3
1Bh
LOAD UNLOAD
(optional)
Performs either a rewind operation or a rewind and
unload operation.
4-3.7 on page 4-25
1Ch
RECEIVE DIAGNOSTIC
RESULTS (optional)
Requests that result data generated for a previous
SEND DIAGNOSTIC command be sent to the initiator.
4-3.19 on page 4-83
1Dh SEND DIAGNOSTIC
Requests the target to perform diagnostic tests on itself,
or on the attached peripheral devices.
4-3.27 on page 4-117
2Bh LOCATE (optional)
Causes the tape unit to position to a specific logical
location.
4-3.8 on page 4-28
34h
READ POSITION
(optional)
Causes 20 bytes to be sent from the target to the initia-
tor. The 20 bytes are a report of the position of the tape
unit and information about blocks stored in the buffer.
4-3.17 on page 4-75
3Bh
WRITE BUFFER
(optional)
Used in conjunction with the READ BUFFER com-
mand as a diagnostic function for testing target memory
and the SCSI bus integrity.
4-3.32 on page 4-144
3Ch READ BUFFER (optional)
Used in conjunction with the WRITE BUFFER com-
mand as a diagnostic function for testing target memory
and the SCSI bus integrity.
4-3.16 on page 4-70
40h
CHANGE DEFINITION
(optional)
Used to modify the operating definition of the selected
target with respect to all initiators. This command is
used in conjunction with the Inquiry command to
change (and optionally save) parameters that affect the
operation of the target.
4-3.2 on page 4-5 & 5-
3 on page 5-17
44h
REPORT DENSITY SUP-
PORT (configuration
dependent)
Provides a means for the initiator to retrieve informa-
tion maintained by the target about the supported densi-
ties for the MTU logical unit.
Note: Support of this command is configuration depen-
dent. In order for this command to be supported, FT4
(Feature Mode 4), bit 6 (40h) must be set to 1. See the
command description for more information.
4-3.24 on page 4-105
4Ch LOG SELECT (optional)
Provides a means for the initiator to manage statistical
information maintained by the target about itself and
attached logical units.
4-3.9 on page 4-32
4Dh LOG SENSE (optional)
Provides a means for the initiator to retrieve statistical
information maintained by the target about itself and
attached logical units.
4-3.10 on page 4-33
C1h
LOOP WRITE TO READ
(vendor unique)
Used to check the controller’s data and control path. 4-3.11 on page 4-49
CFh DISPLAY (vendor unique)
Used to display a message on the operator panel of the
tape drive or cartridge loader (if installed.)
4-3.3 on page 4-8 or
4-3.4 on page 4-12
Table 4-1. M2488 SCSI Commands (Continued)
OP
CODE
COMMAND DESCRIPTION PARAGRAPH