The application of RS-422/485 serial communication in control system
Jin Xu · 2001
When the distance among computers in the microcomputer control system is far, computers usually communicate with each other by serial communication. RS-232C and RS-422/485, standards of EIA ,are analyzed briefly, and their features, such as transmission distance, ability of anti noise and voltage deviation, are compared in this paper. Using MC3487 and MC3486, which are products of Motorola, we carry out the voltage shift between RS-232C and RS-422/485 and set up a communication system between a PC and some 8098s. The software flows relative to the communication are also shown in this paper.