| 摘要 |
An electronic device system ( 10 ) includes an electronic device unit (parent device) ( 1 ) connected to an external device ( 5 ) and a plurality of electronic device units (child devices) ( 2 to 4 ) connected in series to it. An initialization instruction from a CPU ( 20 ) of the parent device ( 1 ) turns off all the switches ( 22 ) for opening/closing the RS-485 line connecting all the electronic device units. The parent device ( 1 ) successively generates identification codes (ID). A parent device ( 1 ) starts to set the code as its ID and turns on the switch ( 22 ) of the electronic device unit after the setting is complete. Thus, ID's are automatically set from the parent device ( 1 ) to the child devices ( 2 to 4 ) successively in the order of the connection.
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