Data relay device, data relay method and data transmission system

A data relay method for notifying control data indicating its own specification to transmitting equipment to receive data in a form matching to its own specification, the method performed by a data relay device, comprising:

• acquiring control data from receiving equipment employing a control system connected in a latter stage;
• determining whether its own specification is in a higher order or not in comparison a specification indicated by the control data from the receiving equipment with its own specification;
• rewriting the control data from the receiving equipment by its own control data and notifying it to the transmitting equipment when it is determined in the determining that its own specification is in the higher order;
• receiving the data transmitted from the transmitting equipment and reproducing it in accordance with its own specification;
• and
• converting the received data from the transmitting equipment into the specification of the receiving equipment and transmitting it thereto.

A data transmission system, comprising:

• a transmitting equipment for acquiring control data indicating a specification to transmit data in a form matching to the specification;
• a receiving equipment for notifying control data indicating its own specification to receive the data from the transmitting equipment;
• and
• a data relay device connected between the transmitting equipment and the receiving equipment, wherein the data relay device comprises:
• a control data acquiring device configured to acquire the control data from the receiving equipment;
• a specification determining device configured to determine whether its own specification is in a higher order or not in comparison a specification indicated by the control data from the receiving equipment with its own specification;
• a control data notifying device configured to rewrite the control data from the receiving equipment by its own control data to notify it to the transmitting equipment when the specification determining device determines that its own specification is in the higher order;
• a data reproducing device configured to receive the data transmitted from the transmitting equipment to reproduce it in accordance with its own specification;
• and
• a data transmitting device configured to convert the received data from the transmitting equipment into the specification of the receiving equipment to transmit it thereto.