| 摘要 |
PROBLEM TO BE SOLVED: To enable a user to easily know that an auxiliary device for assisting image forming operation is reset. SOLUTION: The image forming apparatus 1 includes a main body device 10 and an optional device 20. The main body device 10 includes: a communication I/F part 19 transmitting a command to the optional device 20 or receiving a response from the optional device 20; a storage part 16 storing an effect that the communication I/F part 19 has received a response showing that a power source is turned on; a control part 11 determining the reset of the optional device 20, when the communication I/F part 19 receives the response showing that the power source is turned on, if the reception by the communication I/F part 19 is the second and succeeding ones; and a user I/F part 12 displaying the determined result. The optional device 20 includes: a power detection part 25 detecting turning-on of a power source; a control part 21 preparing a response showing that the power source is turned on when the power source is turned on; and a communication I/F part 29 receiving a command from the main body device 10 or transmitting the response showing that the power source is turned on to the main body device 10. COPYRIGHT: (C)2009,JPO&INPIT
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