Apparatus for controlling the opening and closing of electric doors

An elevator control apparatus comprising:

• drive means for opening and closing the car door of an elevator;
• operation management control means which is installed in a machine room of the elevator and which generates, in parallel, a command signal for controlling the operation management of the car, said operation management control means generating a door open ready signal when said door is in the state where it can open;
• door control means including a program controlled microcomputer which is installed in said car and which controls said drive means based upon the command signal generated by said operation management control means, said door control means generating, in parallel, status signals indicating the status of said door:
• a first serial-parallel converter for serializing the command signal generated by said operation management control means;
• a second serial-parallel converter which deserializes the command signal serialized by said first serial-parallel converter and which serializes the status signals generated by said door control lines;
• serial transmission means which connects said first and second serial-parallel converters to each other and which transmits the serialized command signal and the serialized status signals, said serial transmission means including two transmission lines;
• and
• an open ready signal line separate from said transmission lines which connects said operation management control means and said door control means to each other, and which transmits the door open ready signal from said operation management control means to said door control means;
• said first serial-parallel converter deserializing the status signals which have been serialized by said second serial-parallel converter, said door control means microcomputer operating under a program which directs said drive means to open said door only when the program determines that both a command signal, which commands the opening of said door, has been received via said serial transmission means and the door open ready signal has been received via door open ready signal line from said operation management control means.