Operating instructions

9-4
SCSI REFERENCE 1012975
CHAPTER 9—MODE SELECT (15h)
Assigning Element Addresses
An element is a way of classifying various components in the autoloader.
Element addresses reference specific physical locations in the autoloader. All of
the libraries contains three element types: the cartridge loader, cartridge cells
and the tape drive (known as the medium transport, storage, and data transfer
elements, respectively). Each element requires an address so that it can be
identified during a SCSI command operation. The autoloader has default
addresses assigned to each element. Ta b l e 9 - 2 lists the default element address
for each element in the autoloader.
If you want to change the addresses of the autoloader’s elements, use the
Element Address Assignment page. In this page, you assign a starting address
for each element type (cartridge loader, cartridge cells, and tape drive) and
then specify the total number of elements of that type. Since there is only one
cartridge loader and one tape drive, the starting address you specify for these
elements is the only address for that element. The element addresses for the
cartridge cells are numbered consecutively, with the first address being the
starting element address that you specify.
Because the autoloader supports the saved page function, you can save the
element address values by setting the SP bit in the CDB to 1. These values
configure the autoloader upon power-up or a reset condition.
Table 9-2 Default element addresses for each element in the autoloader
Element Default Starting Address
First Storage Element 1 (01h)
First Data Transfer Element 82 (52h)
First Medium Transport Element 86 (56h)
!
! !
! Important
For the starting element addresses, you can specify any 16-bit
binary number, with the following conditions:
 Element addresses must not overlap.
 Addresses for the storage elements must be consecutive. The
highest address you can assign for the first storage element is
0FFF9h (1111111111111001b). This causes the last storage
element to be numbered 0FFFFh (1111111111111111b).