Patent ID: 7444437

Claim:
An input/output device, comprising: a plurality of device enclosures; a plurality of units mounted on respective ones of said plurality of device enclosures; a table indicating a correspondence between an object device, specified by an external device, and a corresponding unit, of said plurality of units; and a control unit that logically connects the external device with a specified object unit, based on said table, wherein: each unit, mounted on a corresponding one of said plurality of device enclosures, is assigned respective slot identification information that does not overlap slot identification information assigned to another unit within said corresponding device enclosure; each said device enclosure is assigned respective device enclosure identification information that does not overlap with device enclosure identification information assigned to another device enclosure and is assigned unique slot identification information based on the assigned device enclosure identification information before each unit is assigned the respective slot identification information, the respective device enclosure identification information being assigned at power-on of the input/output device, and said table specifies a unit in a corresponding input/output device, by respective unit identification information, determined by said slot identification information and said device enclosure identification information, which does not overlap respective unit identification information of another unit in the input/output device, the table being formed at power-on of the input/output device after the enclosure identification information is assigned and after the unique slot identification information for each of said device enclosures is assigned, wherein each respective unit identification information is a single bit sequence.