INQUIRY (12h)The INQUIRY command requests that information regarding parameters of the medium changer be sent tothe 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 theMedium Changer and Vital Product Data can comprise several pages of additional data. Each VitalProduct Data page requires a separate INQUIRY command from the initiator. An INQUIRY command is notaffected by, nor does it clear, a Unit Attention condition.Bit 7 6 5 4 3 2 1 0Byte0 Operation Code (12h)1 LUN Reserved Obsolete EVPD2 Page Code3 (MSB) Allocation length4 (LSB)5 ControlField descriptions:EVPD:Enable Vital Product Data. An enable vital product data (EVPD) bit of one specifies that the deviceserver shall return the optional vital product data specified by the page code field. Note If theEVPD 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 INQUIRYcommand, if the EVPD bit is set to 1. The following pages are supported:v 00h - Supported vital product pagesv 80h - Unit serial number pagev 83h - Device Identification pagev C0h - Firmware build information pagev D0h - Vendor Specific Pagev FFh - Vendor Use OnlyAllocation Length:Specifies the number of bytes of inquiry information the media changer is allowed to return to theinitiator during the command s data-in phase. Error status is not returned if the value in this fieldtruncates the requested information.Standard Inquiry DataBit 7 6 5 4 3 2 1 0Byte0 Peripheral Qualifier (0) Peripheral Device Type (08=Medium Changer)1 RMB (1) Reserved2 Version (5)3 Obsolete Obsolete NormACA(0)HiSup Response data format (2)4 Additional length (43h)3-4 TL2000 and TL4000 SCSI Reference
