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Chapter 4: SCSI Commands
4-4
July 2004
81-81276-01 Rev A01
4.4
INQUIRY (12h)
INQUIRY tells the tape drive to send information regarding its parameters to the initiator.
Figure 4-2.
INQUIRY (12h) Command Descriptor Block — Data Format
The INQUIRY command executes normally even if the specified LUN is not supported. INQUIRY
returns a CHECK CONDITION status only when the target cannot return the requested INQUIRY
data. If a tape drive receives INQUIRY from an initiator with a pending UNIT ATTENTION condition
(before the tape drive reports CHECK CONDITION status), the tape drive performs the INQUIRY and
does not clear the UNIT ATTENTION condition.
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code (12h)
1
Logical Unit Number
Reserved
EVPD
2
Page Code
3
Reserved
4
Allocation Length
5
Unused
Reserved
Flag
Link
Table 4-3.
INQUIRY (12h) Command Descriptor Block — Field Descriptions
Field Name
Description
LUN
Logical Unit Number. The target ignores this field. Only an IDENTIFY message
can change the LUN.
EVPD
Vital Product Data. The tape drive implements the Vital Product Data pages option
on LUNs 0 and the optional medium loader LUN.
Page Code or Operation
Code
The tape drive implements three Vital Product Data pages:
Code
00h
80h
C0h
Page Definition
Supported Vital Product Data pages
Unit Serial Number page
Code Build Information page.
If the Page Code field contains a different value, the tape drive generates a CHECK CONDITION with
ILLEGAL REQUEST Sense Key.
Summary of Contents for DLTtape DLT1
Page 1: ...DLT1 VS80 SCSI Interface Guide...
Page 6: ...DLT1 VS80 SCSI Interface Guide vi July 2004 81 81276 01 Rev A01 Notes...
Page 12: ...Table of Contents xii July 2004 81 81276 01 Rev A01 Notes...
Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
Page 181: ......