Scalar DLC Reference Guide 273
SCSI Command Format
The SCSI command format follows the SCSI-2 and SCSI-3 standard. Table below describes the CDB fields
that are common to all commands.
SCSI Command Status Byte
Both the Scalar 1000 and Scalar 10K enter the status phase once per command, unless a retry is requested
by the initiator. Table below describes the library return status bytes.
2Bh POSITION TO ELEMENT
1Eh PREVENT/ALLOW MEDIUM REMOVAL
3Ch READ BUFFER
B8h READ ELEMENT STATUS
1Ch RECEIVE DIAGNOSTIC RESULTS
17h RELEASE
03h REQUEST SENSE
B5h REQUEST VOLUME ELEMENT ADDRESS
16h RESERVE
01h RE-ZERO
1Dh SEND DIAGNOSTIC
B6h SEND VOLUME TAG
00h TEST UNIT READY
3Bh WRITE BUFFER
Command Description
Logical Unit
Number
The library has a single Logical Unit Number (LUN). The library always appears as LUN
0. If the LUN is specified in the IDENTIFY message, the LUN field in the CDB is ignored
by the library.
Reserved The word Reserved or Rsvd refers to a field defined by the SCSI standard as 0. The
library checks the field for 0. If the field is not 0, the library returns Check Condition
status with a sense key of Illegal Request.
Control Byte The vendor unique portion of the Control Byte is defined in the specific command.
Not
Implemented
This description indicates that the field is a SCSI standard but is not supported by the
library.
Operation code Command
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