
Messages
Quantum DLT 8000 Tape System 4-7
4.2.5 IDENTIFY Message (80h - FFh)
The IDENTIFY message is sent by either the initiator or the drive to establish or re-
establish the physical connection path between an initiator and target for a particular
logical unit, under the conditions listed below. Figure 4–2 shows the format of the
IDENTIFY message and Table 4–5 describes the data field contents.
Bit 7 6 5 4 3 2 1 0
Identify DiscPriv LUNTAR Reserved LUNTRAN
Figure 4–2 IDENTIFY Message — Data Format
Table 4–5 IDENTIFY Message — Field Description
Field Description
Identify The Identify bit must be set to 1. This identifies the message as an
IDENTIFY message.
DiscPriv Disconnect Privilege. The DiscPriv can be 0, provided that no other I/O
process is currently active in the drive. If not set to 1 and other I/O
processes are currently active in the drive, the drive returns BUSY status.
LUNTAR The Logical Unit/Target Routine (LUNTAR) field must be set to zero. The
drive supports a single Logical Unit Number (LUN 0). A LUNTAR bit of
one causes the drive to send a MESSAGE REJECT message and switch to
the BUS FREE phase.
Reserved The Reserved bits must be zero. If a Reserved bit is non-zero, the drive
returns a MESSAGE REJECT message and switches to the BUS FREE
phase.
LUNTRN Logical Unit Number.
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