Design of Radio Transmitting Stations Remote Monitor and Control System——Design of Serial Port Multiplexer

A kind of serial port expansion based on a STC12C5608 single-chip microcomputer and a VK3234 asynchronous serial interface chip is designed.Through the main serial port expansion,four sub-serial ports are expanded,the way of data transmission reuse serial data is realized,the problem of shortage of serial port is solved.The microcontroller program is written by Keil C51,and it is convenient to modify and transplant.In practical applications,the serial extended system performance is stable and reliable,meets the demand.Serial interface way SPI extension techniques are used,quantity of the extension serial port is increased or decreased according to the demand and convenience.