Apparatus and method for changing bus line address for a detachable battery unit

An electronic instrument including a plurality of battery unit attaching sections configured to accommodate a plurality of battery units each respectively composed of at least one battery, comprising:

• a bus line configured to receive a communication signal from at least one battery unit;
• a body side controller configured to receive the communication signal from the at least one battery unit via the bus line;
• and
• a bus line address changing device including a bus line address storing member configured to store a plurality of bus addresses allocated for and corresponding to the plurality of battery unit attaching sections, and including a bus address selecting and setting member configured to select and set one of the plurality of bus addresses according to the battery unit attaching section when the battery unit is attached and electrically connected to the bus line.

A bus line address changing method for use in an electronic instrument, comprising the steps of:

• providing a plurality of battery unit attaching sections configured to accommodate a plurality of battery units respectively composed of at least one battery;
• providing a bus line configured to receive a communication signal from at least one battery unit;
• providing a body side controller configured to receive the communication signal from the at least one battery unit via the bus line;
• providing a bus line address storing device configured to store a plurality of bus addresses allocated for and corresponding to the plurality of battery unit attaching sections;
• and,
• providing a bus address selecting and setting device configured to select and set one of the plurality of bus addresses according to the battery unit attaching section when the battery unit is attached and electrically connected to the bus line.

An address changing apparatus for use in an electronic instrument including a plurality of battery unit attaching sections configured to accommodate a plurality of battery units each respectively composed of at least one battery, comprising:

• transmitting means for transmitting a communication signal from at least one battery unit to the electronic instrument;
• means for receiving the communication signal from the at least one battery unit via the transmitting means;
• address storing means for storing a plurality of addresses allocated for and corresponding to the plurality of battery unit attaching sections;
• and,
• address selecting and setting means for selecting and setting one of the plurality of addresses according to the battery unit attaching section when the battery unit is attached and electrically connected to the transmitting means.