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《Ordnance Industry Automation》 2004-03
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RS485 Bus Communication of Remote Distributed Measurement and Control System

LIAN Guang-yao1,HUANG Kao-li2,ZHENG Si-long1(1.Department of Missile Engineering,Ordnance Engineering College,Shijiazhuang,050003,China;2.College of Power Engineering,Nanjing University of Science and Technology,Nanjing,210094,China)  
The communication protocol of RS232 to RS485 is translated with serial port control functions and I/O functions of Lab Windows/CVI, in order to realize communication control of RS485 bus in the remote distributed measurement and control system. At first, open COM ports and initialize them, send steering order and acquire sample signals. The local controller sends steering order to field signal-acquisition equipments and receives test data from RS485 bus, thereby communication control of RS485 bus was realized. The reliability of communication control can be improved greatly as a result of Win timer that can checks the states of COM ports was used in program.
【CateGory Index】: TP273
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