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ACL 4/52 Software Interface Guide
Document 6211225-03
Version 3.0
3-12
SCSI Interface
Inquiry (12h)
The host uses the Inquiry Command to determine the devices attached
to the SCSI bus. Using this command, the host can request a
description from each device. The description provided by the library
identifies the type of device, manufacturer, and the nature of the
supported SCSI interface.
Only the standard Inquiry data format is supported.
The format for this command data block is shown in Table 5.
Table 5: Inquiry
Command
Logical Unit Number
The Logical Unit Number must be set to 0. This field indicates
which logical unit the command should be sent to.
EVPD
The Enable Vital Product Data (EVPD) bit should always be zero.
An EVPD bit of zero specifies that the target returns the Standard
Inquiry Data.
Allocation Length
This field contains the maximum amount of data that may be
returned. Anything greater than 36 returns the full 36 bytes of data.
Page Code
Vital Product Data Page Code. The ACL 4/52 returns only the
Standard Inquiry Data. This field is not used and must be set to 0.
The format for the Standard Inquiry Data block returned by the library
to the initiator is shown in Table 6.
Bit/Byte
7
6
5
4
3
2
1
0
0
Operation Code (12h)
1
Logical Unit Number
Reserved
(0h)
EVPD
(0)
2
Page Code (00h)
3
Reserved (00h)
4
Allocation Length
5
Reserved (00h)