ACL 4/52 Software Interface Guide
Document 6211225-03
Version 3.0
3-40
SCSI Interface
Read Element Status (B8h)
The host can determine the status of any of the library’s elements by
issuing a Read Element Status Command. The type of element
(medium transfer, storage, import/export or data transfer) can be
specified in the command as well as the starting address and number
of elements for which status information is to be returned.
The library automatically updates its internal element status every
time the status changes. The library inventory initializes the
information and it is updated with each move. Because the
information is updated with each move, no action is required by the
library other than returning the information it has stored.
The format for the Read Element Status Command block is shown in
Table 26.
Table 26: Read Element
Status Command
Logical Unit Number
The Logical Unit Number is 0.
Bit/Byte
7
6
5
4
3
2
1
0
0
Operation Code (B8h)
1
Logical Unit Number
VolTag
Element Type Code
2
(MSB)
Starting Element Address
(LSB)
3
4
(MSB)
Number of Elements
(LSB)
5
6
Reserved (00h)
7
(MSB)
Allocation
Length
(LSB)
8
9
10
Reserved (00h)
11
Reserved (00h)
