Operating instructions

15-2
SCSI REFERENCE 1012975
CHAPTER 15—READ ELEMENT STATUS (B8h)
15.2 WHAT YOU SEND TO THE AUTOLOADER
VolTag – Byte 01, Bit 4
This bit indicates whether you want the autoloader to return volume tag (bar
code label) information in response to this command, as follows:
0 – Do not return volume tag (bar code label) information
1 – Return volume tag (bar code label) information
Element Type Code – Byte 01, Bits 3 through 0
This field specifies the particular element types you want the autoloader to
report on. The autoloader supports the following Element Type Codes:
0h – All element types
1h – Medium Transport Element (cartridge loader)
2h – Storage Element (cartridge cells)
4h – Data Transfer Element (tape drive)
For an Element Type Code of 0h, the element types are reported in element
address order, beginning with the Starting Element Address.
Note: If you specify element type code 3h, the autoloader returns Good status
and an Element Status header with all fields set to 00h.
Starting Element Address – Bytes 02 and 03
This field indicates the element address at which to start the transfer of data.
Only elements with addresses greater than or equal to the starting address are
reported. Element descriptor blocks are not generated for undefined element
addresses.
Number of Elements – Bytes 04 and 05
This field specifies the maximum number of element descriptors to be
returned. This is an actual number of element descriptors to be returned, not
an element address range.
The autoloader returns element descriptors of the requested element type
starting with the first element address equal to or greater than the value in the
Starting Element Address field.
CURDATA – Byte 06, Bit 1
The CURDATA (current data) bit determines whether the autoloader allows
device motion in order to update element status, as follows:
0 – May use motion to confirm device status
1 – May not use motion; must use currently available data