Design And Implementation Of Multiport Serial Device Server

In recent years,with the rapid development of Ethernet technology,networking technologyequipment base on Ethernet is used widely in all areas"All the equipment can connect to thenetwork''has become the inevitable trend of information society development However,inindustrial production and automation control field,there are a large number of traditional serialequipments based on RS232 protocol data communications,serial communications protocolbecause of its simple,high reliability is still in use ever since；the other hand,because of itstransmission distance is short．and can not be connected to the mainstream netvc-orks and otherdefects,the development of serial communication is faced with tremendous pressures andchallenges Thus,a solution which serial devices can be connected to the current mainstreamnetwork-Ethernet for data transferring under the premise that it is not need to replace the oldequipment and to avoid consuming a lot of manpower and material resources need to be foundurgentlyThe serial server that allows multiple serial devices access to the networking immediatelyfor transmission of serial data via Ethernet was born The remote hosts or remote serial devicescan interaction and communication with each other．It eliminates the limit of transmissiondistance and the centralized management ofthe all equipment can be achievedThe main research COntents and results are as follows:1 This paper introduces the status ofthe serial server,and the advanced solutions2 Responsible for the overall architecture design,including requirements analysis,dividedfunction module and the key technology solutions3 Overview-the hardware platforms of Serial Server,including the ARM9 processor$3C2440,UART expansion chip V554,RS232／RS422／RS485 multiplexing chip SP336E,andother hardware modules4 Complete the serial server software design under the embedded Linux C languageprogramming based on ARM9 processor,and descript the details of the main modules,such as the concurrent server module,the data buffer module,the parameters configuration module andPacket Strategy and SO on5 Test the performance of system and analyze the testing data...