User's Guide

Chapter 2 Emulated Medium Changer SCSI Commands
Read Element Status (B8h)
56 Quantum DX-Series Software Interface Guide
• 4 indicates data transfer elements
• Starting Element Address and Number of Elements
These fields are used to select the range of elements to report. Within
this range, no status information is reported for an undefined
element address.
• Only elements matching the indicated type are returned
• No elements with an address smaller than the Starting Element
Address are reported
• Beginning with the first defined element with an address greater
than or equal to the Starting Element Address, all defined, type
matching elements are reported until reports for the indicated
number of elements have been returned
• Allocation Length
This field specifies how much memory the host has set aside to store
the status information returned by the DX-Series system.
• This field should be set to a number that is large enough to store
the status information for the requested number of elements
• If the field is not large enough, the DX-Series system only reports
the status information for the number of elements whose status
information fits within the allocated space
The returned Read Element Status Data has the general structure as
depicted in
figure 1.