Operating instructions

SEPTEMBER 2005 MAGNUM 1X7 LTO AUTOLOADER
8-3
WHAT YOU SEND TO THE AUTOLOADER
Parameter Pointer – Bytes 05 and 06
The Parameter Pointer field allows you to request parameter data by
specifying any of the following types of values.
 A log parameter code. When you are requesting the Tape Alert page, System
Statistics Log page or the Environment page, specify a log parameter code.
The autoloader returns the parameter data for that code and all other codes
in ascending order until the value specified in the Allocation Length field
has been reached or until it completes sending parameter data for the
highest code.
Example
If you specify 02h for this field in the System Statistics page, the
autoloader returns statistics Total Number of Put Retries, Total Number of
Scans, and so on, until there are no more statistics or the Allocation Length
is exhausted.
 An element address value. When you are requesting the Element Statistics
Log page, or the Scan Retries page, specify an element address value. The
autoloader returns the parameter data for that element and all other
elements in ascending element address order until the value specified in the
Allocation Length field has been reached or until it completes sending
parameter data for the element with the highest element address.
Example
If you specify 02h for this field (assuming the element addresses
have not been changed), and the Allocation Length is long enough, the
autoloader returns statistics for the storage elements (element addresses
02h-07h), the cartridge loader (element address 56h) and the tape drive
(element address 52h).
Notes:
 When the Parameter Pointer is 0, the autoloader returns all available log
parameters for the specified log page (up to the specified Allocation Length).
 When the Page Code field is set to 00h, the Parameter Pointer field must also be
set to 0, indicating that you are requesting the Supported Log Page (00h), which
lists all log pages.
 Element addresses may have been changed with the MODE SELECT command.
Allocation Length – Bytes 07 and 08
The Allocation Length field allows you to determine the maximum amount of
data to be transferred from the autoloader to the initiator. If you specify an
allocation length that is greater than the bytes available, the autoloader
terminates the Data In phase when all bytes have been transferred. You can
specify 0FFFEh to include all available data.