User's Guide
Table Of Contents
- Preface
- Theory of Operation
- Media Changer Commands
- Overview of Command and Status Processing
- Media Changer Command Descriptions
- Initialize Element Status Command (07h)
- Inquiry Command (12h)
- Load Unload Command (1Bh)
- Log Sense Command (4Dh)
- Mode Select (6) / (10) Command (15h / 55h)
- Mode Sense (6) / (10) Command (1Ah/ 5Ah)
- Move Medium Command (A5h)
- Persistent Reserve In Command (5Eh)
- Persistent Reserve Out Command (5Fh)
- Position to Element Command (2Bh)
- Prevent/Allow Medium Removal (1Eh)
- Read Buffer Command (3Ch)
- Read Element Status Command (B8h)
- Release Element (10) Command (57h)
- Release Unit (6) Command (17h)
- Report Device Identifier Command (A3h)
- Report LUNS Command (A0h)
- Request Sense Command (03h)
- Reserve Element (10) Command (56h)
- Reserve Element (6) Command (16h)
- Send Diagnostic Command (1Dh)
- Set Device Identifier Command (A4h)
- Test Unit Ready Command (00h)
- Write Buffer Command (3Bh)
- Index
Chapter 2 Media Changer Commands
Inquiry Command (12h)
Quantum SuperLoader 3 Software Interface Guide 11
Inquiry Command (12h)
The INQUIRY command allows the initiator to determine the kind of SCSI
devices attached to its SCSI BUS. It causes a device that is attached to a
SCSI BUS to return information about itself. The SuperLoader 3 identifies
itself as a media changer that implements the SCSI-3 protocol.
The media changer can provide three categories of data in response to an
INQUIRY command: Standard Inquiry Data, Vital Product Data, and
Command Support Data. Standard Inquiry Data contains basic data about
the device.
Vital Product Data comprises several pages of additional data.
Each
Vital Product Data page requires a separate INQUIRY command from
the initiator.
Command Support Data indicates the fields in the CDB that
are supported by opcode. An
INQUIRY command is not affected by, nor
does it clear, a
Unit Attention condition.
Figure 2 Inquiry Command
Bit
Byte76543210
0
Operation Code (12h)
1
Logical Unit Number Reserved CmdDt EVPD
2
Page Code
3 - 4
(MSB)
Allocation Length
(LSB)
5
Unused Reserved Flag Link