Design and Application of Communication Device for RS485 Bus Based on LPC2103
HOU Bing-an, WANG Zhen-song, LIU Xiao-yun (Department of Automation, University of Electronic Science and Technology, Chengdu 611731, China) Abstract:The paper introduces software and hardware design of RS485 bus communication device based on LPC2103 in details. The communication device, working between a master computer and slave station nodes, does the polling work once accomplished by the master computer so as to improve the RS485 bus with a master-slave structure. It releases the master computer from busy polling tasks; the independence of the system can be improved, and it is faster for the system to recover from a failure; thus, the reliability and safety of the system are improved effectively. The communication device has been successfully applied in a prison access control system. The system’s performance is improved obviously. Key words:RS485 bus;communication device;prison access control system;LPC2103 |