Control system, display device, control-use host computer, and data transmission method

A data transmission method, applied when a data processing device transmits data with a first data processing device and a second data processing device, said data processing device being provided between said first data processing device and said second data processing device, said first data processing device transmitting data according to a first communication protocol, and said second data processing device transmitting data according to a second communication protocol, said method comprising:

• a dedicated protocol communication operation of transmitting data with said first data processing device according to a communication protocol specialized for said first data processing device;
• a data sending operation of, prior to said dedicated protocol communication, selecting a communication protocol from among a group of protocols possessed by itself and sending out preset data according to the selected communication protocol;
• and
• a protocol determining operation of waiting for a response from said first data processing device, and determining a communication protocol to which a predetermined response is obtained as a communication protocol used for data transmission with said first data processing device.

A recording medium storing a program that directs a computer to function as a data processing device (5) provided between a first data processing device (2) and a second data processing device (5, 7) so as to transmit data with said first and second data processing devices (2, 5, 7), said first data processing device (2) transmitting data according to a first communication protocol, and said second data processing device (5, 7) transmitting data according to a second communication protocol, said recording medium storing:

• a program that directs said computer to execute:
• a dedicated protocol communication step of transmitting data with said first data processing device (2) according to a communication protocol specialized for said first data processing device (2);
• a common protocol communication step of transmitting data with said second data processing device (5, 7) according to a communication protocol common to second data processing devices (5, 7) that are likely connected with said data processing device (5);
• and
• a communication protocol converting step of converting the second communication protocol into the first communication protocol, and
• as a program for execution of said communication protocol conversion step, a program that directs the said computer to execute the sub-steps of:
• holding special information of said first data processing device extracted from the first communication protocol and information that is common among said second communication protocols corresponding to the special information, in a form of a conversion table (18a);
• and
• converting common information sent from said second data processing device (5, 7) into special information of said first data processing device (2), referring to said conversion table (18a).

A recording medium storing a program that directs a computer to function as a data processing device (5) provided between a first data processing device (2) and a second data processing device (5, 7) so as to transmit data with said first and second data processing devices (2, 5, 7), said first data processing device (2) transmitting data according to a first communication protocol, and said second data processing device (5, 7) transmitting data according to a second communication protocol, said recording medium storing a program that directs said computer to execute:

• a dedicated protocol communication step of transmitting data with said first data processing device (2) according to a communication protocol specialized for said first data processing device (2);
• a data sending step of, prior to said dedicated protocol communication step, selecting a communication protocol from among a group of protocols possessed by itself and sending out preset data according to the selected communication protocol;
• and
• a protocol determining step of waiting for a response from said first data processing device (2), and determining a communication protocol to which a predetermined response is obtained as a communication protocol used for data transmission with said first data processing device (2).