User's Guide

46 SCSI Commands
Device Capabilities Page (1Fh)
The Device Capabilities page defines the rules governing cartridge movement within the library. It describes
from which element type to the next a cartridge can be moved, directly defining which element types can be
used as either source or target elements. The library does not allow the medium transport element
(accessor) to be a target, and only as a source on a limited basis.
Parameters Savable (PS) – This page is not savable, and this field is set to zero.
Page Code – This field identifies the Device Capabilities mode page and returns 1Fh.
Parameter List Length – This field is set to 0Eh (14).
Data Transfer (DT) – This field is set to 1 to indicate that the data transfer elements (drives) can store
cartridges.
Import/Export (I/E) – This field is set to 1 to indicate that the Import/Export elements can store cartridges.
Storage (ST) – This field is set to 1 to indicate that the storage elements can store cartridges.
Medium Transport (MT) – This field is set to 0 to indicate that the accessor cannot store cartridges.
The remaining element type to element type fields describe the allowable source to target transitions. A
zero is returned for any transition involving the Medium Transport (MT) except for when the MT is a source
and the destination is either I/E or Storage. A one is returned for all other transitions.
All Mode Pages (3Fh)
When this page is requested, all supported mode pages are returned in ascending order.
Table 43 Device Capabilities Page (1Fh)
Bit
Byte
76543210
0 PS Rsvd Page Code (1Fh)
1 Parameter List Length = 0Eh
2 Reserved DT 1 I/E 1 ST 1 MT 0
3 Reserved
4 Reserved
MT to DT 0 MT to I/E 1 MT to ST 1 MT to MT 0
5 Reserved
ST to DT 1 ST to I/E 1 ST to ST 1 ST to MT 0
6 Reserved
I/E to DT 1 I/E to I/E 1 I/E to ST 1 I/E to MT 0
7 Reserved
DT to DT 1 DT to I/E 1 DT to ST 1 DT to MT 0
8
:
15
Reserved