Call signal conversion apparatus for elevator system

In a call signal conversion apparatus for an elevator system which comprises a call button device as a serial connection of a call button and a call registration lamp;

• a control device as a computer for inputting a call signal given by actuation of the call button, registering the calling and outputting a call registration signal;
• and a signal conversion circuit connected between said button device and said control device an improvement characterized in that said signal conversion circuit comprises a call detection circuit for detecting said call signal;
• a waveform shaper circuit which shapes said call signal to output the signal to said control device;
• a memory circuit having an input coupled to the control device for memorizing said call signal or said call registration signal from the control device;
• and a driving circuit for outputting a signal for turning on or off said call registration lamp by detecting an output of said memory circuit and for supplying a signal equivalent to said call signal to said control device through said call detection circuit and said waveform shaper circuit.