MODE SENSE 6 (1Ah)The MODE SENSE (6) command provides a means for a device server to report parameters to anapplication client. It is a complementary command to the MODE SELECT (6) command.Bit 7 6 5 4 3 2 1 0Byte0 Operation Code (1Ah)1 LUN Reserved DBD Reserved2 PC Page Code3 Subpage Code4 Allocation length5 ControlField descriptions:DBD: The Disable Block Descriptors bit specifies if the media changer may return block descriptor afterthe Parameter List Header. The media changer does not support block descriptors, therefore thisbit is ignored.PC: The Page Control field defines the type of mode parameter values to be returned in the modepages.00b Report Current Values (equal to default values if no pages previously saved)01b Report changeable values10b Report Default Values11b Report Saved Values (equal to default values if no pages previously saved)Page Code:The page code defines which pages should be returned. See next table. A Initiator can requestone or all mode sense pages. Each response includes a four bytes for the Parameter List Header,followed by the specified number of bytes for each page:Page Code SubpageCodeNumberbytesPage Name Page Description00h 00 4 Parity Page Provides a means to read out the setting formaximum number retries on parity errors.0Ah 01h 32 Control Extension Page Provides a means to read out the capabilities ofthe SET TIMESTAMP and REPORTTIMESTAMP commands.1Ch 00h 12 Tape Alert Page Allows the host to see what mechanism is usedto report Tape Alert events.1Dh 00h 20 Element AddressAssignment PageProvides a means to read the SCSI elementaddress assignments and respective elementranges.1Eh 00h 4 Transport Geometry Page Provides a means to read the specifics aboutthe Medium Transport Element.1Fh 00h 20 Device Capabilities Page Provides a means to read the library'scapabilities.20h 00h 8 Event Filter Page (VendorSpecific)Provides a means to read out the currentselected event filter settings.3-30 TL2000 and TL4000 SCSI Reference
