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

A storage medium storing a program that causes a computer to function as a display device provided between a control unit and a data processing device so as to transmit data to said control unit according to a dedicated protocol and transmit data to said data processing device according to a common protocol, said storage medium storing said program that causes said computer to execute:

• dedicated protocol communicating including transmitting data to said control unit according to a communication protocol specialized for said control unit;
• common protocol communicating including transmitting data to said data processing device according to a communication protocol common to the data processing device that is connected with said display device;
• and
• communication protocol converting including converting the common protocol into the dedicated protocol;
• and
• as a program for execution of said communication protocol conversion, said program that causes the said computer to execute sub-steps of:
• holding special information of said control unit extracted from the dedicated protocol and information that is common among said common protocols corresponding to the special information, in a form of a conversion table;
• and
• converting common information sent from said data processing device into special information of said control unit, referring to said conversion table.

A storage medium storing a program that causes a computer to function as a display device provided between a control unit and a data processing device so as to transmit data to said control unit according to a dedicated protocol and transmit to said data processing device according to a common protocol, said storage medium storing said program that causes said computer to execute:

• dedicated protocol communicating including transmitting data with said control unit according to a communication protocol specialized for said control unit;
• data sending including, prior to said dedicated protocol communicating, sending a protocol determination command from said display device to said control unit, the protocol determination command being used for selecting, from among a group of protocols, a communication protocol to be used for data transmission between said control unit and said display device possessed by itself and sending out preset data according to the selected communication protocol;
• and
• protocol determining including waiting for a response from said control unit, and determining a communication protocol to which a predetermined response is obtained, as a communication protocol to be used for the data transmission between said control unit and said display device.