DESIGN AND IMPLEMENTATION OF MULTI-GRADE COMMUNICATION SYSTEM FOR COALMINE

Design technology adopting relay-substation designed with dual-port ram to implement two-grade or multi grade communication of monitor and control system based on Centralized distribution model is stated in this paper.In order to increase communicate efficiency and speed of the system,relay substation is made up of dual-port and dual single chip microcomputer,which can implement communication in dual direction at same time.The effect of usage in coal mine is good.