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a. Qualifier Field
(0,0,0): The specified logical unit shows the type of input/output device shown in the
"Device Type Code" field. Even if this code is reported, it does not mean that that
logical unit is in the ready state.
(0,0,1): The specified logical unit shows the type of input/output device shown in the
"Device Type Code" field, but it shows that an actual input/output device is not
connected to that logical unit. The IDD does not report this code.
(0,1,1): Shows that the specified logical unit is not supported. When this code is reported,
it X '1F' is shown in the "Device Type Code" field.
b. Device Type Code
(0,0,0,0,0): Direct Access Device
(1,1,1,1,1): Undefined Device
When LUN=0 is specified, the IDD reports "(0,0,0,0,0) : Direct Access Device" as the
device type code. At this time, the "Qualifier" field is "(0,0,0)." Therefore, byte 0
indicates X '00.' On the other hand, when a LUN other than "0" is specified, the IDD
reports "(1,1,1,1,1) : Undefined Device" as the device type code.
"Qualifier" field is "(0,1,1)." Therefore, byte 0 indicates X '7F.'
c. RMB Bit
When this bit is "1," it indicates that the memory media has a variable configuration. The
IDD is a fixed disk device, so this bit is always reported as "0."
d. Device Type Qualifier
A zero is always reported for this field.
e. SCSI Standard Version
Byte 2 displays the code which shows the level of the SCSI standard the IDD is applicable
for. Depending on the specification in the CHANGE DEFINITION command, the IDD
reports either (0,0,1) or (0,1,0)as the applicable level of the ANSI standard. Furthermore,
"ANSI Version" code definitions are as follows.
Code
0
0
0
Devices applicable to ANSI X3. 131-1986.
0
0
1
Devices complying with the ANSI X3.131-1986 standard.
0
1
0
Device to which standard ANSI X3T9.2/86-109 (SCSI-2) was applied.
Definition
C141-E039-01EN
At this time, the
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