Inter-system connection adapter and terminal

A system connection adapter, comprising:

• a command A transmitting and receiving means which transmits and receives a command A relating to a system A;
• a command B transmitting and receiving means which transmits and receives a command B relating to a system B which is made up by using a protocol different from a protocol used by the system A;
• a frame B transmitting and receiving means which transmits and receives a communication frame B relating to the system B;
• an intersystem command correspondence memorizing means which memorizes correspondence relation between the command A and the command B;
• a command A analyzing means which analyzes the command A from the command A transmitting and receiving means, and judges, with reference to the intersystem command correspondence memorizing means, whether to establish a correspondence between the command A and the command B;
• a command conversion means which establishes, with reference to either one of a judgement result by the command A analyzing means and the intersystem command correspondence memorizing means, the correspondence between the command A from the command A transmitting and receiving means and the command B from the command B transmitting and receiving means, and converts the command A and the command B from one to the other so as to mediate transmission and reception between the command B transmitting and receiving means and the command A transmitting and receiving means;
• and
• a frame encapsulation and decapsulation means which performs one of encapsulation and decapsulation, with reference to the judgement result by the command A analyzing means, of the communication frame B from the frame B transmitting and receiving means and the command A from the command A transmitting and receiving means so as to mediate transmission and reception between the frame B transmitting and receiving means and the command A transmitting and receiving means.