User's Guide

Chapter 2 Emulated Medium Changer SCSI Commands

Mode Sense (1Ah)

40 Quantum DX-Series Software Interface Guide

Table 30 Mode

Sense Command

Bit/Byte 7 6 5 4 3 2 1 0

• Logical Unit Number

The Logical Unit Number field must be set to 0. This field indicates

the logical unit to which the command is sent.

• DBD

• When the Disable Block Descriptors field is set to 0, the target

may return 0 or more block descriptors in the returned Mode

Sense data at the target’s discretion

•A DBD bit of 1 specifies the target does not return any block

descriptors in the returned Mode Sense data

•PC

The Page Control field defines parameter type values to return:

• 0 — requests current parameter values for the specified page

code for the DX-Series system - current values returned are the

default values

• 1 — requests the target to return the changeable parameter mask

for the page code specified - the page indicates which parameters

are changeable

• 2 — requests the target return the default values for the page

code specified

• 3 — requests the target return saved values for the page code

specified - only the Vendor Unique Page has changeable/

savable parameters

Operation Code (1Ah)

Logical Unit Number

Rsrvd

(0)

DBD Reserved (00)

PC Page Code

Reserved (00h)

Allocation Length

Reserved (00h)