Operating instructions

22-2
SCSI REFERENCE 1012975
CHAPTER 22—SEND DIAGNOSTIC (1Dh)
22.2 WHAT YOU SEND TO THE AUTOLOADER
Byte 01, Bit 4 – PF (Page Format)
This field specifies whether the format of the parameter list for the SEND
DIAGNOSTIC command conforms to the page format defined in the SCSI
standard, as follows:
0 – The parameter list uses non-page format. This value is only valid if the
SelfTest bit (byte 01, bit 2) is set.
1 – The parameter list uses the SCSI page format. This value is valid for all pages.
Byte 01, Bit 2 – SelfTest
This bit specifies whether the autoloader should perform its default diagnostic
self-test, as follows:
0 – Perform the diagnostic tests specified in the Parameter List.
1 – Preform the default diagnostic self-test. The Parameter List Length must
be 0.
Byte 01, Bit 1 – DevOffL
This bit specifies whether the autoloader is allowed to perform diagnostic tests
whose results may be detected by subsequent I/O processes (for example unit
reservations, log parameters, or sense data), as follows:
0 – The autoloader may not perform diagnostic tests whose results may be
detected by subsequent I/O processes.
1 – The autoloader may perform diagnostic tests whose results may be detected
by subsequent I/O processes.
Byte 01, Bit 0 – UnitOffL
This field specifies whether the autoloader is allowed to perform diagnostic
tests that might affect the tape, such as writing data or repositioning the tape,
as follows:
0 – The autoloader may not perform diagnostic test that might affect the tape.
1 – The autoloader may perform diagnostic test that affect the tape.