Electronic equipment system, electronic equipment, and optional apparatus

An electronic equipment comprising:

• a bus line that includes a serial line for use in outputting to a plurality of optional apparatuses a command signal and a select line for use in selectively outputting to the plurality of optional apparatuses one of a signal indicating an optional apparatus as a destination or a signal instructing all of the optional apparatuses to perform simultaneous communication as a select signal;
• and
• a main body side controller which outputs a command signal and a select signal to the plurality of optional apparatuses through the bus line, wherein
• when controlling a storage section provided in the optional apparatus to store the command signal, the main body side controller changes a command-save-bit, which is a predetermined bit among bits constituting the command signal, to be in a predetermined state and outputs the command signal,
• when controlling a command executing section provided in the optional apparatus to execute the command signal, the main body side controller changes the command-save-bit not to be in the predetermined state and outputs the command signal, and
• the main body side controller, when controlling each of the optional apparatuses to execute a processing in accordance with the command signal stored in the storage section in advance, the main body side controller changes the select signal to be in a predetermined pattern indicating the simultaneous communication and outputs the select signal.

An optional apparatus comprising:

• an option side controller which accepts a command signal outputted from an apparatus main body through a serial line included in a bus line when a select signal outputted from the apparatus main body through a select line included in the bus line indicates an optional apparatus in which the optional side controller is provided;
• a storage section which stores the command signal accepted by a control of the option side controller;
• and
• a command executing section which executes a processing in accordance with the command signal accepted by a control of the option side controller, wherein
• when a command-save-bit which is a predetermined bit among bits constituting the accepted command signal is in a predetermined state, the option side controller controls the storage section to store the command signal and prohibits the command executing section from executing a processing in accordance with the command signal,
• when the command-save-bit is not in the predetermined states, the option side controller prohibits the storage section from storing the command signal and controls the command executing section to execute a processing in accordance with the command signal, and
• when the accepted select signal is a signal indicating a simultaneous communication of all of the optional apparatuses, the option side controller reads the command signal stored in the storage section in advance and controls the command executing section to execute a processing in accordance with the command signal.