| 摘要 |
PURPOSE:To decide the mounting of an additional device without providing any dedicated signal line by judging whether or not the additional device is mounted on a device main body according to a divided voltage divided by a voltage dividing means. CONSTITUTION:Driver circuits 19a and 19b constitute a control means and the ON/OFF operation of a corresponding solenoid is controlled according to a control signal, e.g. pulse signal of 5V from a control part 17. Further, the control part 17 has a judging means, which judges the mounting state of a corresponding additional device 3a according to the output-side level of the circuit 19a, i.e. the signal level at the connection point between resistances Ra1 and Ra2 or the output-side level of the circuit 19b, i.e. the signal level at the connection point between resistances Rb1 and Rb2. |
