Connection management method for devices connected digital interface and command structure therefor

A connection management method comprising the steps of:

• (a) establishing a connection between a first device for transmitting information using a predetermined data transmission format and a second device for receiving the information, wherein said first and second devices are connected by a predetermined digital interface;
• (b) transmitting a connection management command for controlling a connection management status to at least one of the first and second devices, wherein the connection management command comprises connection register information which specifies an output plug control register within the first device for transmitting the information or an input plug control register within the second device for receiving the information, identification information which specifies an input or output plug at which a connection is established, and an operand which specifies at least one connection status parameter bit field of the output plug control register of the first device or the input plug control register of the second device and indicates that the control device desires to be notified of a future change of the at least one connection status parameter bit field;
• and
• (c) controlling the connection between the first and second devices when a response to the connection management command indicating a change in the connection status parameter bit field is received.

A method for indicating a connection status change between a plurality of devices having a connection which is established in a network system wherein a first device for transmitting data through a predetermined data transmission format and a second device for receiving the data are connected by a predetermined digital interface, the method comprising generating a connection management which comprises:

• connection register information which specifies an output plug control register within the first device for transmitting the data or an input plug control register within the second device for receiving the data;
• identification information which specifies an input or output plug at which a connection is established;
• and
• an operand for which specifies at least one connection status parameter bit field of the output plug control register or the input plug control register, wherein command structure indicates that a control device desires to be notified of a future change of the at least one connection status parameter bit field.