Messages

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

Byte

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.

 

 

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Identify Message 80h FFh, Identify Message Field Description, Luntran, Luntar, Luntrn
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