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3.1 Control/Sense Commands
C141-E167 3 -
15
This command specifies a different SCSI level in the "SCSI level" field in SCB byte 3. The SCSI
level is indicated by 1 byte of code as shown in the following table. If a code other than the
following codes is specified, the command is terminated by a CHECK CONDITION status
(ILLEGAL REQUEST [=5] / Invalid field in CDB [=24-00] and the SCSI level and operation mode
are not changed.
Operation Code (HEX) SCSI Level
X'00' Not Change
X'01' SCSI-1 (Same as CCS)
X'02' CCS (Same as SCSI-1)
X'03' SCSI-2
*1 X'04' SCSI-3
*1 Set at shipping time.
If zero is specified in the "SCSI Level" field, the IDD operates at the current SCSI level without
changing the SCSI level. However, if the correct operation mode parameter (described later) is
transferred at the same time, the IDD changes its operation mode.
The total byte length of the operation mode parameter transferred by the INIT with this command is
specified in the "Parameter List Length" field in CDB byte 8.
If zero is specified in the "Parameter List Length" field, the command is terminated normally with
only the SCSI level being changed.
When changing the operation mode, the "Parameter List Length" field must always be specified by
the length (=8) defined by the operation parameter, described later. If a value other than the defined
length in the "Parameter Byte Length" field is specified, this command is terminated with a CHECK
CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in CDB [=24-00]) and the SCSI level
and operation mode are not changed.
If the IDD's operation mode is changed by this command, a UNIT ATTENTION condition (UNIT
ATTENTION [=6] / INQUIRY Data has changed [=3F-00]) is generated for all the INITs except
the INIT that issued this command.
The format for the operation mode parameter transferred by this command from the INIT to the IDD
is shown below. If the operation mode parameter is transferred in a format other than that shown
below, this command is terminated with a CHECK CONDITION status (ILLEGAL REQUEST [=5]
/ Invalid field in parameter list [=26-00]) and the SCSI level and operation mode are not changed.