| 摘要 |
PURPOSE: To dispense with a troublesome setting even if a plurality of function expanding options are added to the apparatus, to prevent malfunction caused by mis-setting etc., and to make it possible to detect misconnection to connectors, etc. CONSTITUTION: A pulse motor 1 for example is made connectable as a function expanding option to the control board 2 of an electric apparatus such as a microfilm reader printer etc. Besides, it is possible to drive the pulse motor 1 by connecting a resistor R1 to the pulse motor 1 in series, inputting its terminal voltage to a CPU 4 through an A/D (anolog-digital) converter 3, and turning drive transistors Tr1-Tr4 on by signals from the CPU 4. And the connection of the pulse motor 1 is detected with the CPU 4 by the voltage drop of the resistor R1, and setting of an expanded function by the pulse motor 1 is performed automatically. |
