This standard defines the model and command set extensions to facilitate operation of automation/drive interfacedevices. The clauses of this standard, implemented in conjunction with the applicable clauses of SPC-3, fullyspecify the standard command set for automation/drive interface devices.The objective of this standard is to provide the following:a) permit an application client to communicate over a SCSI service delivery subsystem, with a logical unit thatdeclares itself to be an automation/drive interface device in the PERIPHERAL DEVICE TYPE field of thestandard INQUIRY data (see SPC-3);b) define commands unique to the automation/drive interface device type; andc) define commands and parameters to manage the operation of the automation/drive interface device typeand the operation of logical units of other specific device types that are present in the same device as theautomation/drive interface logical unit.The following commands, parameter data, and features defined in previous versions of this standard are madeobsolete by this standard: Linked commands.Figure 1 shows the relationship of this standard to the other standards and related projects in the SCSI family ofstandards as of the publication of this standard.Figure 1 is intended to show the general relationship of the documents to one another. Figure 1 is not intended toimply a relationship such as a hierarchy, protocol stack, or system architecture. It indicates the applicability of astandard to the implementation of a given transport.Commands in this standard do not require the use of a specific SCSI transport protocol.