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ACL 4/52 Software Interface Guide
Document 6211225-03
Version 3.0
3-6
SCSI Interface
Identify (Initiator to Target)
The host sends this message to the library to identify the library to
which the command is being sent. This message also indicates whether
the library may disconnect during the command.
The Identify message from the host overrides the unit number in the
command descriptor block. If the library receives an Identify message
from the host, the library ignores the unit number in the command
descriptor block. If an Identify message is not received, the library uses
the unit number in the command descriptor block. The library
does not
disconnect during an operation under these circumstances.
Identify (Target to Initiator)
When the library uses the Disconnect message to disconnect from the
host, the library sends an Identify message to the host after completing
the operation and reselecting the host. The library number in this
Identify message is the same as the library number in the Identify
message the host sent to the library at the start of the operation.
The library does not support any target routines.
The host does an implied Resume Pointers when the Identify message
is received from the library.
Save Data Pointer
The library sends this message to the host, when data transfers are
broken into multiple connections, before disconnection using the
Disconnect message.