User's Guide

Chapter 2 Emulated Medium Changer SCSI Commands
Inquiry (12h)
16 Quantum DX-Series Software Interface Guide
Inquiry (12h) 2
The host uses the Inquiry command to determine devices attached to the
SCSI bus and request a description from each device.
Inquiry Command
Data Format
2
The description provided by the DX-Series system identifies the device
type, manufacturer, and nature of the SCSI interface. The format for this
command data block is shown in
table 9.
Table 9 Inquiry
Command Data
Format
Bit/Byte 7 6 5 4 3 2 1 0
0
1
2
3
4
5
• Logical Unit Number
The Logical Unit Number must be set to 0. Field indicates the logical
unit to which the command is sent.
• EVPD
• When the Enable Vital Product Data (EVPD) bit is set to 0, only
Standard Inquiry Data is returned
• When the bit is set to 1, the target returns the optional vital
product data specified by Page Code field (see
table 11)
• Allocation Length
Field contains the maximum data amount that the DX-Series system
may return.
Operation Code (12h)
Logical Unit Number Reserved (0h) EVPD
Page Code
Reserved (00h)
Allocation Length
Reserved (00h)