Operating instructions

6-2
SCSI REFERENCE 1012975
CHAPTER 6—INQUIRY (12h)
6.2 WHAT YOU SEND TO THE AUTOLOADER
EVPD (Enable Vital Product Data) – Byte 01, Bit 0
This bit indicates the type of inquiry data you are requesting, as follows:
0 – Standard inquiry data (described on page 6-3).
1 – Vital product data (described on page 6-8), based on the Page Code field
(byte 02).
Page Code – Byte 02
This field contains the page number of the vital product data page to be
returned for this INQUIRY command. The autoloader supports the following
page codes:
00h – Supported Vital Product Data page
80h – Unit Serial Number page
83h – Device Identification page
C0h – Original Data page
F0h – Code Level page
If the EVPD bit is set to 0, the Page Code must be 00h.
Allocation Length – Byte 04
This field specifies the number of bytes that the initiator has allocated for
returned inquiry data. A value of 0 indicates that no inquiry data is to be
transferred. This condition is not an error.
The autoloader terminates the Data In phase when it has transferred either the
number of bytes specified by the Allocation Length field or all of the available
inquiry data, whichever is less. The lengths for inquiry data returned by the
autoloader are:
 6Ch (108) bytes for the Standard Inquiry Data
 0Ah (10) bytes for the Supported Vital Product Data page
 10h (16) bytes for the Unit Serial Number page
 2Ch (44) bytes for the Device Identification page
 6Ch (108) bytes for the Original Data page
 60h (96) bytes for the Code Level page
6.3 WHAT THE AUTOLOADER RETURNS
When the EVPD bit (byte 01, bit 0) is 0, the autoloader returns 108 bytes of
Standard Inquiry Data, as described in the following section.