INQUIRY (12h)
The INQUIRY command requests that information regarding parameters of the medium changer be sent to
the initiator. The media changer can provide two categories of data in response to an inquiry command:
Standard Inquiry Data and Vital Product Data. Standard Inquiry Data contains basic data about the
Medium Changer and Vital Product Data can comprise several pages of additional data. Each Vital
Product Data page requires a separate INQUIRY command from the initiator. An INQUIRY command is not
affected by, nor does it clear, a Unit Attention condition.
Bit 7 6 5 4 3 2 1 0
Byte
0 Operation Code (12h)
1 LUN Reserved Obsolete EVPD
2 Page Code
3 (MSB) Allocation length
4 (LSB)
5 Control
Field descriptions:
EVPD:
Enable Vital Product Data. An enable vital product data (EVPD) bit of one specifies that the device
server shall return the optional vital product data specified by the page code field. Note If the
EVPD bit is set to 0, the page code must be 00h.
Page Code:
This field contains the page number of the vital product data page to be returned for the INQUIRY
command, if the EVPD bit is set to 1. The following pages are supported:
v 00h - Supported vital product pages
v 80h - Unit serial number page
v 83h - Device Identification page
v C0h - Firmware build information page
v D0h - Vendor Specific Page
v FFh - Vendor Use Only
Allocation
Length:
Specifies the number of bytes of inquiry information the media changer is allowed to return to the
initiator during the command s data-in phase. Error status is not returned if the value in this field
truncates the requested information.
Standard Inquiry Data
Bit 7 6 5 4 3 2 1 0
Byte
0 Peripheral Qualifier (0) Peripheral Device Type (08=Medium Changer)
1 RMB (1) Reserved
2 Version (5)
3 Obsolete Obsolete NormACA
(0)
HiSup Response data format (2)
4 Additional length (43h)
3-4 TL2000 and TL4000 SCSI Reference
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