Bi-directional serial bus system for constructing electronic musical instrument

An electronic musical instrument apparatus for generation of music sounds, comprising:

• a bus supporting a session of transfer of data by a bi-directional serial communication;
• and
• a plurality of devices belonging to different categories having different priorities and being connected to the bus for exchanging control data effective to control the generation of the music sounds, wherein
• one of the devices may become a source device to initiate a session to transfer the control data while another of the devices may become a destination device to receive the control data when addressed by the source device, and
• in case a conflict occurs such that two or more of the source devices try to commence respective sessions to respective destination devices of different categories, the source device having the session to the destination device of the category having the highest priority precedes to establish the session.

An electronic musical instrument apparatus for generation of music sounds, comprising:

• a bus supporting a session of transfer of data by a bi-directional serial communication, and being equipped with at least a first connector having a standardized configuration and a second connector having the same standardized configuration;
• a keyboard device being manually operable to input control data, and having a first bus terminal of a standardized configuration adapted to engage with the first connector of the bus for conducting a session of transfer of the control data;
• a panel device being manually operable to input control data, and having a second bus terminal of the same standardized configuration adapted to engage with the second connector of the bus for conducting a session of transfer of the control data;
• and
• a host device connected to the bus for receiving the control data from the keyboard device and the panel device so as to manage the generation of the music sounds, wherein
• the keyboard device may alternatively engage with the second connector by the first bus terminal and the panel device may alternatively engage with the first connector by the second bus terminal.

An electronic musical instrument apparatus for generation of music sounds, comprising:

• a bus supporting a session of transfer of data by a bi-directional serial communication for managing the generation of the music sounds, and being equipped with at least a first connector having a standardized configuration and a second connector having the same standardized configuration;
• a first device having a first bus terminal of a standardized configuration adapted to engage with the first connector of the bus for conducting a session of transfer of first data;
• a second device having a second bus terminal of the same standardized configuration adapted to engage with the second connector of the bus for conducting a session of transfer of second data, wherein
• the first device may alternatively engage with the second connector by the first bus terminal for transfer of the first data, and the second device may alternatively engage with the first connector by the second bus terminal for transfer of the second data.

An electronic musical instrument apparatus for generation of music sounds, comprising:

• a bus supporting a session of transfer of a control packet by a bi-directional serial communication;
• and
• a plurality of devices being connected to the bus for exchanging the control packet effective to control the generation of the music sounds, wherein
• one of the devices may become a source device to initiate a session to transfer the control packet while another of the devices may become a destination device to receive the control packet when addressed by the source device, the control packet containing address information effective to specify the destination device.

An electronic musical instrument apparatus for generation of music sounds, comprising:

• a bus supporting a session of transfer of control data by a bi-directional serial communication;
• and
• a plurality of devices being connected to the bus for exchanging the control data effective to control the generation of the music sounds, wherein
• one of the devices may become a source device to initiate a session to transfer the control data while another of the devices may become a destination device to receive the control data when addressed by the source device, the control data containing address information effective to specify the destination device.

An electronic musical instrument apparatus for generation of music sounds, comprising:

• a bus supporting a session of transfer of control data by a bi-directional serial communication;
• one or more of manual input device for inputting the control data and being adaptable to the bus for conducting a session of transfer of the control data, the manual input device including a plurality of visual elements for visually indicating music information associated to the generation of the music sounds;
• and
• a host device being adaptable to the bus for receiving the control data from the manual input device so as to manage the generation of the music sounds, the host device further conducting a session to transfer control data including a group message and a mode message to the manual input device, the group message being effective to divide the plurality of the visual elements into groups, and the mode message being effective to totally control a mode of indicating the music information by the visual elements in the same group.