ELEVATOR SIGNAL CONTROL CIRCUIT

摘要

The circuit having a key board and a clock display includes an up/down hall-call registering button and up or down call registering relays by adopting a microprocessor control for a reserved call registering of the hall call. Collectors of the transistors are connected to a power supply source via reserved call driving relays. Normal open contact points signals of the reserved call driving relays are supplied to an input buffer via resistors and capacitors. The outputs of the input buffer are connected to the data lines. Address lines of the microprocessor are connected to a decoder having an output supplied to a first AND gate and an output to a second AND gate. A read signal of the microprocessor is supplied to the first AND gate. Output signals of the AND gates are supplied to enable terminals of the output buffers, and the normal open contact points of the reserved call driving relays are parallelly connected to both ends of the hall-call button.