| 摘要 |
A communication controlling method and apparatus, a communication controlling system, and a transmission medium exchanges a plurality of media by using a simple command. In controlling exchanging of a plurality of media, a medium exchanging sub unit and a medium driving sub unit are defined, and in the OPC of a command which instructs the medium exchanging sub unit for movement of a medium, a code of a command for instruction for loading or unloading of a predetermined medium is placed: in the OPR1 a slot number of the medium exchanging sub unit (changer) in which the predetermined medium is accommodated is placed; and in the OPR2 a number of a port through which a medium is to be loaded into or unloaded from the medium driving sub unit by the medium exchanging sub unit is placed.
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